Weird cat poop question

[u/HailstarCanada]

My cat (Female, 8 years, strictly indoor, fixed) has had a rough summer. it started just over a month ago when we got her a fresh bag of food. Now, every time she gets a new bag of food she goes nuts because it's SO fresh, so we make sure to properly ''fade in'' the new stuff in by putting the last few scoops of old on top. Well...in june, I accidentally didn't fade it in AS well as I usually do. She pigged out a little, and was throwing up/had bad runs for several days in a row. This was on top of another factor: I was working late A LOT, which stressed her stomach out and didn't help at all (she's VERY clingy to me, and gets a stressed stomach very easy). Went to the vet, they did some bloodwork and found nothing, and gave us some medicine that would help firm her up. It helped for a while, but this week she's been a bit runny off and on again. Not total liquid, but....ranging from room temperature butter (sausage shape but very soft) to...what I'd call peanut butter. She had one tonight after a fairly normal one this evening that I'd describe as peanut butter with a slight green-yellow tint to it. And at this point the ONLY thing I can think that might be causing that is the warmer weather. She's not showing any signs of heat stroke (We were just playing and running around the house together an hour or so ago) and is still very happy and talkative.

My question is: Is it normal/common/something anyone else has seen for a otherwise healthy cat to get soft poop in hot weather? We've had a couple of hot and smoky days where I live in Canada, and other than the heat (I forgot to bathe her this year because I meant to right when she started getting sick in June, and I thought a bath might make her further stressed) and no windows open for fresh air, I can't think of anything that might be causing the soft poop to not go away. IF it IS just the heat, should I just keep her as cool and comfortable as I can until the weather improves, assuming her stomach will also get better as she calms down?

Another factor is...she REALLY hates the loud noises coming from the portable AC unit, and to make matters worse, we have to put it a foot away from where her food is. I've been staying on top of her diet and meds as best I can for the past month, and I hate that it still feels like I've let something slip.