It just hit me!

She has not really been asking for money lately, and seems to not be working much.

If the ex just popped back into the picture, she could be with him since she knows he has to give her money because of the kid. And if she gives him attention, he will be more inclined to give her money.

Do you know why I think that? She insinuated such in a conversation. So it's not that she's madly in love with him; she really resents him and the way he treated her in the past. But he's another source of money in a world where money means so much.

That's my theory right now.