Not sure if you mean only BF her if she doesn't eat anything or if you mean an extra BF if she doens't eat anything... If you mean it the first way, don't do it, imo. She needs the milk!!! Not sure how many times/day she's doing but 4-5 iswhat she needs. Can you just try to make the purees chunkier for now so she gets some texture? Is she teething or tired at meal time? Or maybe try BF and then waiting 30-60 minutes so she's hungrier when you give her the solids and more likely to try the finger food? Neve when through a week where she cried at most meals and barely ate a thing (mostly at lunch) and I figured out she was super tired and not at all happy about solids. It got better.
Another idea that I used for Aiden is to make a mashed potato or sweet potatoa dn then mix in grated carrot, or zucchini or whatever, add egg yolk or whole egg and make patties I would then bake in the oven until firm so he could hold them but they practically fell apart when he ate them. He really liked those around 7/8 months and they froze decently. I added all kinds of stuff the more I mde them- cooked broccoli bits, otameal, ground flax, hamburger, peas, etc. Eventually I stopped using the potato as the base and used meat instead and made little meat patties.