My friend has a tank full of guppies. He has one guppy who is really really pregnant, and she had 1 baby about 3 days ago. She is still huge, but it doesn't seem like she can deliver the rest of the babies. She seems like she's having a hard time. She's been hanging out in one corner of the tank and appears distressed, although she still comes out to eat and swim around. Does anyone have any experience with this?