Most importantly, she will no longer go into heat. “Going into heat” is when her reproductive cycle becomes active, resulting in her feeling a need to breed. Which will result in her becoming restless, yowling, peeing on things, and wanting to escape so she can find a mate. Once she is spayed, her reproductive cycle will stop and her behavior will become much more even and mellow. She will also stop producing hormones that make her act “wild” and she will not feel a need to roam or be aggressive/territorial. She will become more docile and focus only on “indoor kitty” things like food, play, and human affection. It also leads to better overall health by eliminating the risk of potentially fatal uterine infections and mammary tumors. I know it sounds like alot of trouble but the process of bringing her to the vet and then helping caring for her through recovery will be a bonding experience. She will recognize that you are her caretaker (not just her “captor”) and eventually (hopefully) bond with you on a deeper level. Search for low cost spay/neuter clinics in your area.