Update,
I took her to the scheduled vet appointment on 4/9 and it went pretty good. She was 7.9kg which indicated a very small weight gain. This was 10 days after I fed her the 2 large rats. The vet thought her body condition was okay and was not concerned with her feeling squishy in some areas. She was not sure why her activity level was poor. She also told me to hold off with any vitamins and it's up to me if I want to continue the Nutribac.

She also said to say with (1) 275-300g rat every 10 days for now. She is going to reach to her colleague about an optimal rodent size/frequency and let me know. I mentioned feeding an amount that is 5% of the body weight. My vet let me know that an average adult boelens weight is 8.6kg. I let her know that I want her to gain weight and be around 8.5kg. I'm pretty sure that is where she was before any of this started. She thinks her weight may increase in the warmer months without changing her diet. I scheduled a recheck appointment 8 weeks from then.

She finally pooped, a little bit and I dropped off a sample. It came back normal again so that isn't the problem.

She pooped a large amount on 3/18
I fed her the (2) 250-275g rats on 3/31 and that is the last time she ate.
She pooped next a little bit on 4/6
She pooped next a little bit on 4/10
She pooped next a little bit on 4/11

Yesterday, 4/11 I noticed she pooped a little bit and that she was still trying to go. I also noticed her body was swollen by her vent and it felt like there was a rock in there. I soaked her in warm water and tried gently massaging the area to help her go but I didn't have any luck.

I reached out to my vet today and showed a picture of the swollen area. They told me to bring her in asap rather than next week. I bought her in today and they did an xray. They think it's either a messed up egg or poop. They also think this is a life threatening emergency. They thing the redness on her underside is due to sepsis and I think it's because she is going into another shed, her skin is loose around the neck again.

They want me to drop her off first thing tomorrow morning to perform an enema which requires full anesthesia.

They already started her on the following medications,
Ceftiofur
Enclosed
Metronidazole

Today's visit cost me $900! and tomorrow will cost me $1500!

Should I have the enema done tomorrow?
Can this really be caused by feeding her 2 large rats one time?
I thought I felt a small area by her vent about a month ago that felt hard. I'm thinking maybe this started a while ago and not it's gotten much worse.

Can this explain the poor activity level these past few months and with the weight loss?

I first reached out to this forum asking if it's okay to feed again if the snake hasn't defecate and was told it's okay. I never fed her sooner than every 10 days and only fed her the 2 rats the one time.