Nice thought but actually dogs can do quite a bit to hurt themselves in the home.I doubt she could have hurt herself as she has been in the home for the past couple of days.
Mostly by jumping on or off furniture or beds. My brother's SBT managed to break her leg jumping off a bed and crash landing. They can eat something they shouldn't like a whole croc rubber shoe or sock or undies or strapping tape, or nappy out the bin. Nappies are really poisonous but taste delicious according to my dog. The dirtier the better. Yuck.
Some anxious dogs will run around bashing into things or if they're in a crate - bust all their teeth on the steel mesh of the crate. I know of a border collie who busted her teeth on her crate. The owner ended up getting her a very special kind of crate that she was unable to get her teeth into the shade cloth mesh of it.
The thundershirt is good but I don't think it's meant to be left on all the time. Plus you want to start her getting used to your environment without it. So a bit of time on and a bit of time off - like an ice pack almost - hopefully it came with relevant instructions?
If she's been living in a concrete floored cage - kennel, she's probably not exactly house trained - so you will need to supervise toileting same as for a puppy. Make sure you take her out for a pee and poop every two hours while you're home and make sure she gets no food for four hours before bed time. Leaving food out all the time (free feeding) and toilet training tend to be mutually exclusive. So if bed time is 10:30, food gets put away after 6:30pm. Once you're confident about toilet training - you can be less rigid about this but for now, be as strict as you can manage. If she's going to be shut in the house all day - feed her in the evening when you're home to let her out.
So she goes out for pee-poop after eating, after waking up, after play and before bed time. And every two hours if the gap between is longer. An older dog can usually hang on for longer but it does take some training to let the dog know where the appropriate place is to pee/poop.
First few times out - keep her on lead, take her to where you want her to go, say your magic pee poop command. For example "potty time" or mine is "shitnapiss", a friend's was "mr keating" - pick something you're not too embarrassed to say in ear shot of your neighbours.
Praise (and treat if she will take it) for going where you want. Eg outside. on the lawn.
This is the hard part... don't let her back in until you've seen her go. If you're expecting a poop, don't cave in because it's taking too long. Just be boring - stand around and wait - with her on lead so she can't go anywhere. Maybe walk in small circles and encourage sniffing. Pay attention to when she normally needs to crap (how long after dinner is that?) and make sure she's out at those times.
Never assume she doesn't need to go or she's been if you didn't see it happen. Some dogs would rather poop inside for various reasons, like feeling safer or keeping their feet dry and warm, and they will go inside if you cave in early.
And I second - get her checked at the vet for injuries from running, jumping or crashing into things, and for possibly eating something bad. Was she desexed before she was sent to you? there could be a bunch of issues related to her being a breeding bitch (desexed or not) that might cause her to feel in pain and sooky as a result.
What you describe
seems a bit like a dog in pain.She is lying down in a corner of my study just sleeping. She won't come to me, even if i am holding a treat for her.
she might also have bloat. Really scary (life threatening) problem related to eating too soon before or after exercise, but sometimes just happens for no apparent reason.
Or just be knackered from being exercised so much more than she's used to. Imagine an office worker who lives and works in a small cage all day with no exercise, a couple of days into a hiking holiday.
Hope the vet helps with some useful info.