I think it sounds like you have done a great job creating a stimulating environment for your daughter, which is a great thing. It is really way to early to worry about bright versus gifted. I would put that on the back burner till she is closer to school age.
As for things to keep her stimulated during the day. I think I would suggest trying to have some things available for her to do by herself, without your help, or with minimal help. Like an art station with things she can tear up and use a washable glue stick to stick on a page to create something. Or direct her to a bookshelf to look all picture books, or building blocks, etc. Or go outside and just let her explore or dig.
In addition I would suggest you involve her in cooking and preparing food, setting the napkins on the table, and general life skills. I think that this teaching to be independent is really important.
Maybe you already do all these things. In that case maybe someone else will have a suggestion that will help.
Good luck!
