You should definitely take her in to a professional. Any time your child swallow something like this, you should take her in to make sure the object is not stuck on her windpipe or worse. You are very lucky that she did not have this problem and is still a live.

The thread could be stuck anywhere in her gastro-intestinal tract, which is probably why she is experiencing lose movements: only the loser parts of the BM's are making it around the lump and the rest is stuck behind the thread. If you don't get her some medical attention immediately, she could have some very serious problems.