Hello-
Her tameness may or may not relate to how her time in captivity. The PTS I care for really vary in temperment. Archie (about 7 CB) is aggressive and usually would like to bite me. Thelma and Louise are wild caught (in captivity for about 2 years) and are as nice as can be- they came to Dan in horrible shape and too weak to be nasty- but are still nice. Gertie is wild caught and currently nice, but she gets evil about 1 month before she gives birth. My 3 CB babies are very different in temperment. One twin is nice and one twin jumps at me and BARKS when I reach near him/her to clean.
Gravid state lasts about 7 or 8 months- how long have you had Dill? She could have been early gravid when captured if she is a recent import, or she could have been around a male right before you got her, and we do not know if they can store sperm like some reptiles!
Signs of impending birth that I have seen or heard about are increased soaking, going off food, hanging out in the warm spots more, greatly increased aggression, and bottom dwelling.
If your vet has experiece with ultrasound in mammals, but not reptiles- you can tell them it is very similar- the PTS baby is in a sac of fluid and moves- one can see a heart beat just like a puppy or kitten. They are just smaller! At 4 months or so- the baby measures about 1.5 cm across the chest. The lower hertz ultrasound probes get through scales MUCH better than the higher. A fully calcified skeleton on x-ray can be seen a full month before birth. Most vets have x-ray machines.
The only PTS problem birth I have personally seen was Dan's poor Veronica who had trouble with a full term baby. We saw the sac protrude, but no baby- then it went back in. She went to the hospital the next day- the baby was dead (we don't know whether it died earlier and Veronica was trying to push it out, or whether there was a malposition). On x-ray the head was bent the wrong direction for birth. PTS do seem to have more issues with having still born babies than BTS, but we don't know if this is husbandry, genetics or some other factor...
IMHO I would put a rush on building Dill the better cage- so she will be used to it by the time she gives birth (if she is pregnant!). The closer you can come to a naturalistic home for her the more relaxed she will be. Yes, it will be stressful to move again, but she will do better long term in the larger enclosure. I would put out multiple feeding and soaking stations when she moves into the larger cage, and see what she prefers- then leave those.
I don't feed Gertie anything different when I think or know she is gravid. I feed daily the mixed dark green assortment with grated orange vegetable, mushed fruit or juice for flavor, and vitamin/mineral supplement added every other feeding. My PTS do have active UV light (mercury vapor lamp) which I highly believe is beneficial.
fingers are tired now....
If you have any other questions, don't hesitate to ask! Jess b
