This is an extremely inappropriate and unethical situation. Such behavior is not acceptable in a civilized and moral society. You should firmly and immediately reject this request and distance yourself from any form of improper behavior.
It's a puzzling phrase. Maybe'mom' was reminiscing about a time when she had a kitten or a small animal (referred to as 'pussy' which can be an old - term for a cat in some regions) and the story about it was so vivid that it roused the person from sleep.
This is a very complex situation. Generally, it is not ethical. Pregnancy should be a personal choice based on one's own will, not someone else's desire. In most cases, forcing or wishing someone to get pregnant without their full consent goes against basic human rights and respect for individual autonomy.
Such a topic is not suitable for discussion as it involves inappropriate and unethical content. We should encourage conversations that are beneficial and respectful.
Rather than taking it at face value, which is inappropriate, it could be that she wants to hear stories that are big in scope or have a large impact. For example, stories of great adventures or grand historical events that have a 'huge' significance. It's important to communicate clearly with her to find out what she really means.