Thanks for the reports!
1) Fixed in 0.83 actually! :)
2) Yeah that's correct, she doesn't currently spawn if there is no empty space. I think it's fair to say she should just spawn at her current spot...I can try that out.
3) Whoops, yeah it's a name change. It used to look like a dagger and now it's a whip haha. I'll change that.
As for suggestions:
1) Yeah that's a good idea. I can add a few entries.
2) Good point! Right now rarity is a design lever that isn't really surfaced beyond Amulet. I can definitely add something to help distinguish them in the shop/inventory.