How can i convince my mom to let a my friend from another state come visit and stay with us?

I want my friend Jess to come visit me and stay at my house. (we have a guest room) but I feel like my mom will be unwilling to allow a girl to stay in our house. I want to convince my mom because I haven't seen my friend in a year. she is fine with letting my friend who is a guy come visit though. who has any ideas on how to ask my mom and convince her to allow it?