Please help!! I'm not sure what to do!!

[Gocntry]

I have a ball python (she's about 2 years old). I've had her for 10 months.

She recently started staying on the cold side all day (75 degrees cold. The hot side was 85 degrees, but I lowered it to 82 yesterday just in case)
She's still very active at night. She also hasnt pooped in about 3 weeks. She's still readily eating. I was thinking her food is now too small, but I've fed her 4 and she's still not pooping (she's eating small rats so I'm gonna get medium rats next time).
I might be overreacting, but could it be constipation? Am I just not feeding her enough? Maybe she's too hot on the hot side? (Her temp on both sides is monitored with a thermometer and temperature gun just to make sure).
Please help me.

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I have 4 BP's in the 2-3 year old range, They all get small rats (55-65 gram size) every 2 weeks for feeding.

The only time my BP's seem to poop is when they shed. There are no issues with any of them.

I don't think you need to go up to medium rats as one of mine who is on small rats is about 1200 gram and just came off a 6 month feed strike

where she didn't eat over the winter, then just went right back too it. and she's eating about 60 gram rats.

As mine got older, they pooped less but when they do Ewwww .

I also run my hot spot at 88* and the cool side at 77* , lots of times they stay on the cool side, unless they have eaten then it's to the hot hide

Hope this helps....