Sure, OP was simply venting about always babysitting her friend's kids but no one being willing to do the same for her. Then her example was that she invited her friend's daughter to dinner and a movie, but the mom never called back. When she didn't hear back from her, she assumed it was a no go. Then the mom called last minute and was mad that the invitation (?) no longer stood.
The confusion was that the example didn't seem to match the vent. Both situations were certainly worth venting about IMO, but when we asked for clarification the OP got mad and deleted.