Her species is just a BCI and honestly I would be floored if I ever saw a 9-10' male BCI. That thing must have been powerfed from birth to achieve that length. Now a BCC can achieve that but even males, I would be surprised to see over 8' on a male BCC like a Suri or Peruvian. males do stay quite a bit smaller and they biggest thing is they stay much thinner assuming you aren't powerfeeding them. And again yes any BCC or BCI is going to get kind of big but again, a male BCI, I would be surprised if it got over 8', very surprised. Now insular boas like caulker or crawls or hogs will stay smaller if that's what you want.

As for humidity, she will be fine for a couple months as she said she ordered an AP cage and any PVC/HDPE cage is going to hold humidity easy. My Pro-Line that I got my 6' girl in keeps at 50%+ humidity and even tanks can be made easy. Both of my 40 gallon breeders hold 50% and I use aspen in all my cages with nothing but RHPs for PVC cages and CHEs for tanks. People say you NEED 70%+ during shedding and I call BS because I have kept 50-60% humidity for 2 years on my 6' girl and she has never had a shed that didn't come off in 2 pieces at worst, 95% of them are 1 pieces rolled up like a sock. And again i'll say it and it will probably piss off someone but I find UTHs a waste. I have used then once for a few months and dumped it. All I run are ambient heating and its fine.

And I do agree, I wouldn't house your boa and BP in the same enclosure as boas can be carriers of IBD and not affected by it but IBD in a python is quick and 100% lethal. I read about people checking for IBD in boas by throwing a normal BP(because they were cheap) in a critter cage and then putting it in the boa cage and if the python got IBD and died, they knew the boa was a carrier and would keep it out of their collection.