Now that Leslie has mentioned Baily, I realized that our rescued Chocolate Lab, Baby, is exactly the same way. She's been here four years now and will only go out and stay out if we're out.
She used to follow us around even if we only moved from the kitchen table to the sink. She got over that in a few months, but going out was an issue. She'd rather "hold it" instead of go out. We tell her every day that she "lives in the house with us".
One thing we have noticed with rescues that were kept outside (and we've had a few over the years), is that they seem to be afraid of thunderstorms, and often wind and rain. They're IN till it's over, and they know when a storm is on the way HOURS before we do. The sun can be shining away, and Baby is hiding under the kitchen desk.
Good luck with your new "baby". It'll be fine, but will take some time for her to adjust to your home and your "set up". She'll like it tho...believe me!