When H was a newborn, sometimes he'd still be hungry after a feed and make a huge fuss but he'd only need a little bit - maybe 10-20mL. So you could try upping the formula a bit? I'd make up 200mL, and see how much she takes.
As other have suggested, wind or growth spurt could also be the reason. Does she drink the whole bottle at every feed? If not, I'd make sure she nothing is bothering her as wind, dirty nap etc could mean she is not feeding properly. You could also try splitting her feed - so feed, change, then offer the rest of the bottle. If she drinks the whole 150mL, then I'd just offer her more.
7 weeks is far too young for solids, there is a whole heap of research that suggests waiting to 6 months is best.
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