She will adjust to her new life with you. If she is having accidents inside you need to cut down on her free access to your entire home. Either crate or tether her to your side. When you take her out for walks make them purposeful and short. She is an adult so there should be no reason for her to go out in the middle of the night for potty. Also do not free feed her. By putting her food down for her to eat you will be able to set her schedule around your own. Good luck and let us know if you have more questions.
Wanted to add about your food question. Since you are not in the US right now it would be hard for us to suggest they type of food to feed. There are a few members overseas that might be more helpful in this area.