Ingredient vendor left stall in caster's alley and won't return

I’m getting this issue a lot and it’s always the same vendor. Instead of opening the potion ingredients kiosk, she just stands around in front of the wands & tomes kiosk, socializing with whoever happens to be around. Sometimes it’ll be hours in-game before she opens up shop. One time I showed up at 11pm and wanted to buy before and after the daily stock change, but she didn’t open until after 5am.