Thanks for all the responses, guys! We moved her over to an aquarium of her own to help reduce her stress if she is in fact, giving birth soon. Y'all asked for a couple more pics so here is another lot of pics that are closer up and different angles to give y'all a different perspective. Any...
We have noticed the black spot on her belly which also looks a bit boxed-shaped (usually signs of pregnancy). She has been a bit aggressive with the other fish but staying particularly close to one of the other balloon mollies pretty much all the time. She has been staying close to the heater...