Dollshouses come up secondhand alot. I'd be checking fb marketplace if i was you. You can get beautiful houses for next to nothing in perfect condition.
Gives you more budget to play with for other stuff.
My favorite dollshouses are plan toys and pintoys. Pintoys don't exist anymore but come up secondhand all the time. Seaech for wooden dollshouse/dollhouse/dolls house/ doll house use all the spellings and you'll find loads. You can also search ebay for your area.
Plan toys furniture is also nice but expensive and theres loads of alterntives. I like the le toy van one. The le toy van dolls are my favourite set for younger children. But are a bit bigger. The baby goes in the sling and stuff.
When you're talking about small parts it sounds like she'd love maileg. But thats expensive, might be worth exploring though as its somethingyou can add to and it keeps its value. Look at sostrene greene. They have loads of minitures for food, little milk bottles etc. Which are great. Also have benches and rocking chairs and loads of bits.
Petite amelie have a nice wooden dollshouse similar to plan toys but cheaper. Worth a browse. Aldis wooden toy sale is thursday. They have dollshouse and furniture in it.
Also sounds like shes the perfect age for playmobil. Hqve you considered a playmobil dollshouse? I've seen loads secondhand lately for next to nothing. Could buy the house secondhand then buy some sets to go in it. Playmobil is perfect for small world play! All the little parts, cars, etc.