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Kie did your Dr give you any justification for WHY you would give formula instead of breastmilk?
Given that formula is designed to have EXACTLY the same calories as breastmilk, ounce for ounce, and sorry for my bluntness, but its just appallingly stupid advice and I'm frustrated that you paid money for it.
Before you worry about her weight, do make sure she is being charted on the WHO chart, also ask for her weight measurements since birth and plot them on this chart, if she has more or less stayed on the same curve (plus or minus a percentile) then her weight isn't a problem and she is simply petite like you.
If after doing that you are still worried about her weight then yes, try and get an extra breastfeed or 2 in during the day. I had exactly the same issue with daytime distraction and very quick feeds so I fed before AND after each of his naps (so more like 6 times a day).
To avoid the constipation give foods like peach, plum, pear, apricot every day (try buying the organic dried versions and soaking in water overnight then boiling up, pureeing and serving for breakfast.
Since she is a small eater, the key to her eating more will be 6 small meals of solids a day too, if she is ok with dairy products then giving things like yoghurt and cheese will add some more fat to her diet. (but watch for constipation with the dairy). Don't force her to eat against her will, but try and tempt her with a range of textures and tastes and give her the foods she likes best.