this would get anyone down!, you've done well to tolerate it up til now, she obviously thinks you must be pretty cool with it, otherwise surely she wouldnt keep doing it?.
i would bring it up next time, say you totally understand in an emergency, but too often is becoming unsettling, its bad enough trying to prepare yourself for T, then to keep getting cancelled on to me is not on, she should know this, & she shouldnt even be putting you in this situation.
longer you leave it, harder it will be, you deserve better sweetheart, be brave, yeah you may feel uncomfortable for a few moments, but its YOU that matters, beginning to realise T brings uncomfortable moments...... best to face them head on
Biggest

to u hangingon