Hi,

It sounds fine. To be honest, she probably simply doesn't need the formula at all. she is breastfeeding and eating - all she needs. Often when mums start solids they introduce a cup of water as well - but usually babies only take a few sips. Measure out 80 mls and drink it yourself. It's very filling! (and to be honest doesn't taste very nice - try it and get back to me!)
Please don't restrict her solids! At this age she just needs breastmilk and food. These are both nutritionally superior to formula. As she takes less solids, she will take less breastfeeds. (or you can cut a couple out if she doesn't initiate this herself)
To be honest, I'm really confused about whether you want to breastfeed or wean. If you want to breastfeed, which you say you do - don't give her formula! Even in the night. In the second half of the year breastfed babies often sleep through the night. The mother's milk supply adjusts to the new situation and they continue to feed just fine.