What were the circumstances of her being an infant and crying for her mom, who was lying next to her, but never responded?

As you saw intuitively, this was an abduction scenario where the two were taken together and the scene you witnessed was aboard an extraterrestrial vessel where the mother was, in effect, switched off, immobilized, unable to move or react to anything in the environment. Whereas the infant, while constrained physically, was still aware and active mentally, emotionally, and intuitively and was feeling great distress being in a strange place with strange beings and desperately wanting her mother to hold her simply through normal innate reflexes to seek shelter from the nurturing mother and not be separate, especially when threatened. The fact that the mother was unable to respond and totally unaware of the plight of her baby was highly traumatic for the infant. While this happens in life many, many times with infants waking up in the night or having been put down for a nap while the mother might be going to a neighbor to ask for something or go outside to hang up laundry in the sun, and so forth, and not able to respond quickly to the cries of an awakening infant wanting the mother. This was a particularly harmful trauma because of the high strangeness, and the inability to connect intuitively with the mother represented a grave threat for the baby. As babies and mothers engage with one another intuitively, even when separated, this provides some comfort through continuity of experience for the young even though it might not be perceived consciously by the mother, but it, in fact, happens and helps both to cope with separation. When that is blocked, it is especially alarming for an infant. It is as though the mother is dead and the baby will feel the devastation of separation much more keenly because it becomes total with respect to their awareness and perspective.