'Normal for breastfed babies' surprised me--I guess you mean 'normal when you start adding food besides breastmilk'? The consistency you describe isn't at all out of line with just having added food.
It sounds like she is just uncomfortable with the (new?) process. 'Seems like my kids always needed some comforting when they had digestive changes. You can sit with them during the pooping itself and remind them (and yourself) that pooping is OK and they can learn to do it and it's all going to be alright (with words, or just with love-feelings) ... they have to learn not to fear the process, because the fear will hold them back, in the most literal sense! Some babies like to be held, some babies like you to sit next to them, some babies like you to be out of the room so they can really focus themselves ...
If she 'can't' do it by herself (is endangering herself holding it back--stops eating, starts barfing, cries constantly, tummy hurts when you touch it), there are a bunch of naturopathic/homeopathic remedies; I think what finally worked for my constipated baby was baking soda, but I have NO memory of dosages etc. There were two other containers with remedies as well, but I don't remember what they were--two herbs I think, maybe to make a tisane (tea), for him or for me? So if you are into such things, you could ask a naturopath/midwife. I only intervened directly with a 'prescribed' solution one time, on kid number 4, but have also used chocolate (less officially).
That one time was pretty serious, so I had the glycerin suppositories on hand just in case. I was told to not get into using suppositories regularly, so as to not get reliant on them. 'Never used them, so don't know.
Tummy-massages also helped get his body organized on the whole 'learn to poop' situation (he was regular--once a week!!) except the time he was really constipated (let's just say, WAYYYYY more than a week), but make sure you massage in the right direction for the pooping (as I recall, clockwise--but you can look at any biology chart and see which way the small intestines lead into the large). Partly you are actually physically keeping things moving and loose in his tummy, and partly you want to teach his body, "hey, yo, things move THIS way" ;).
The one other thing, is make sure you've found the happy medium between keeping a diaper on and 'sealed' (hold the poop in) and keeping it loose enough to not obstruct the intestines. (When I was a teenager I read that doctors suspected 75% of male intestinal issues were actually from too-tight waistbands (this was the 80s ;) ), and that totally proved true for me personally, and I've watched it with my kids, with elastic waistbands on their pants. Passing gas is particularly affected.)
I've had four kids with four Very Different digestive learning curves ... but at 7 months and eating food, "peanut butter" sounds very very OK. Hopefully your daughter :) just needs some comforting that she is fine and the process is fine and her tummy will be fine, and she'll believe it. With any luck, she's already capable of understanding at least a little the cause-and-effect thing, and if you 'hold' her emotionally through the process and congratulate her at the end, she will 'get' that the hard part means the uncomfortableness goes away.
Good luck!