You have not fallen short. You are launching your requests with zeal and great enthusiasm and loving concern, especially for your loved ones. The problem is at her end of things, not yours. The fact you are doing a 100% job of making requests for her safety is still not a guarantee that she will be protected no matter what. Her local circumstances will be a factor always in anything that might or might not happen to benefit or bring harm. She is still the ruler of her kingdom, so to speak, despite your desire for her to be safe and under divine protection. We say this at regular intervals because the complexities of life make this so, that each person may become their own liability despite good intentions, despite prior requests directly of the divine to keep the individual safe from harm, and so on. Each day is a new day and each thought is a new thought. Each action will have subsequent influences energetically.
Her situation will bring her into contact with others who are potential carriers of the virus more so than the average individual, so this is a conscious choice to put herself at risk. This is not a fault; it is simply stating fact. To what extent the divine can shield her from any airborne virus particles and prevent untoward effects represents a complex energetic equation that varies from moment to moment. People fail to appreciate how their temperament has an interplay directly with their closeness to the divine. When people are harboring a negative thought about someone, feelings of anger, or even just annoyance, the divine will pull away because those vibrations are not in alignment with us. This is simply an energetic response. In the same way, beings within the divine realm who will be watching over an individual and who may be charged directly through requests for maintaining their safety may also have to withdraw for a time if there is an energetic lapse causing a conflicting energetic environment.
In this case, there is a dual liability because of deep karmic history of having difficulty with prior epidemic exposure and succumbing to infection personally. This creates an ongoing inner concern about her status moment to moment with an underlying anxiety she is not aware of consciously. Even though it is against her best interests, this must be honored as a free will choice to be at risk because her deep subconscious believes this to be so and, in effect, is choosing that state of being in the moment. This is not a dominating theme and under most conditions would give rise to an intermittent period of greater risk that would wane when a better part of her mind comes to the foreground and lets go of the concern about her vulnerability, and she feels strong once again so protections can resume with full force and vigor. This does impart greater risk, and these two factors coupled together proved to create this situation where live virus particles in her environment could not be removed actively by her guardians, and once inhaled, the karmic predisposition held sway, and that allowed her to develop a diagnosable degree of infection.
This is not the worst of all possible worlds because it does not mean she will succumb. It will be an inconvenience to be sure and a painful episode that will add to her karmic burdens, for a time at least, but this can and will be worked on with the Lightworker Healing Protocol. As you know, karma can take quite a long time to be healed successfully because there are so many underlying circumstances, times and places, and interactions with many, many others. It is a time‑consuming undertaking to reach anything close to a state of completion even for a single issue of this kind, but especially when it is significant, when you need the benefit the most is when the obstacle is the greatest and more likely to intrude on the current life and create a noticeable problem—that is the case here. So continued prayer work will be very helpful in minimizing the impact of the illness and hasten her recovery, as well as the ongoing karmic repair of the Protocol work to support her in the highest and best way that can be done, and this can make a meaningful difference in the outcome.