Dalvie

Dalvie is one of the residents of Transylvania, and the owner of Little Shop Of Horrors and will be found after the Manor quest.

To access their shop they will ask you to sample their wares, to sample their wares you need to find Marin, in the Manor after the Manor quest.

After talking to Marin you can try to apologise, by apologising she will ask you to wear items and please her.

After that you will need to buy her items to access Dalvie's shop, insulting you in a way as you purchase them.

After buying the items and return to the shop, you can talk to Dalvie and inquire about the locked door, if you did the order correctly, you will be talking to them for a while and be able to enter shop.