I managed to get Snow Drop on the last roll.
The ticket went to Nipplewort.
...and only afterwards I got a recommendation for Ivy, since her debuffs are pretty powerful in the tower, but I got her using other means afterwards.

I guess I'll start stocking FGs now. Primarily for Easter, since I'd like to have Isogiku (Easter) at some point, though that depends if any other interesting girls appear before then.