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Hello, I'm Dr. Deb and will do my best to help with this concern about this poor girl.
It sounds as if she's been through a lot of bad things in her short life and that she'd be lucky to spend the rest of her life with you.
Unless she's spayed and her uterus/ovaries are removed, she theoretically could still become pregnant. Even though she's been malnourished and suffered, her reproductive system may still be functional, especially if she's taken care of.
Most shelters and rescue organizations that I'm affiliated with and know about will spay/neuter as part of their routine protocol. If she's in rough shape, they may wait until she's healthy to perform this procedure but it's something that I'd expect them to do.
Whether or not she might develop problems with her hips as she ages is something that we clearly won't know until she's older; however, keeping her on the lean side as opposed to carrying even a small amount of extra weight will help to reduce this possibility.
I hope this helps and that things work out with her. Deb