Went to BBB in February, and there are now Isabella and Mirabel dresses. They have cute $30 accessory packs with 4 things, like Mirabel's glasses, and Isabel's has a flower bracelet and hair clip. Dresses themselves looked not great, not as nice as many of the others in BBB. I'm surprised the dresses made it into BBB, honestly, at this quality. And we were waiting forever in the shop, so I looked at everything.
If you want an Encanto makeover, I'd bring a dress and buy the $30 accessories. I have definitely seen better dresses.
The hairstyles were the same. There wasn't an Isabella hairpiece or anything, or even colors to match.