Go to
masstimes.org and find the nearest Catholic Church. Find out when Mass times are on Sunday and Saturday evening. If it the church is very close, you may be able to walk. Otherwise, a taxi is an option, as is trying to figure out the bus schedule in advance.
Mass is important to you and your friend should be supportive. Even if she doesn’t want to attend, maybe she could bring a book and read outside the church if it’s a nice day. Or maybe there’s a coffee shop on the same block where she could hang out until you’re finished.
I read one of my favorite analogies for this type of situation on CAF a few years back. Suppose you needed weekly dialysis or a weekly medical appointment while you were visiting? What friend wouldn’t go out of their way to be accomodating and help you get to the appointment on time, even though they personally had no need for it? Likewise, Mass is important for your spirirtual health and soul. You’re a great witness to the faith when you explain how important it is to you to attend.
God bless.