My grandmother has a large collection of porcelain dolls that she made herself. Is there any way of determining their value?
Handmade dolls will be found under the title OOAK porcelain dolls. Since we have no idea as to what type/style/size/quality/dress/sort of dolls your grandmother made or any idea as to how well they are done you will have to look at dolls and maybe come up with an idea yourself.
Doll shows/craft fairs are the places to look in person but here is a link to OOAK dolls currently listed on eBay and Etsy: