Yes it does seem shady, but not at all surprising.
First, do you have receipts for the money that you have been giving her to help her out? Seems like she is going for child support, and even though she may make more money it has a lot to do with how much time you spend with your child. In the separation papers that you received, was there any papers on child custody?
Seems like your case in falling through some cracks with a lack of communication. You may have to start calling people everyday until someone listens to you. In many cases you have to be persistent in order to get results.
Find out who your child