this kind of crap really burns my arse...and one of the reasons I have convinced myself not to feel bad for currently being on FMLA for 2 months
I used to get outright denied my vacay requests for whatever BS reason someone could come up with at the time (even caught her put in for the same day for herself AFTER I submitted mine,,,,she had seniority and I swear it was just to screw me over). There were 2 I had to answer too....one has been replaced so it's not quite as bad.
Next time she wants to cancel your day remind her about this and tell her TS