When a woman sends you a friendship request, it usually means they’ve read your profile and taken an interest in you. So by all means, send them a polite message back, usually starting with something like ‘thanks for your friend request’, and maybe asking what their interest or ambition is concerning ABF. (Best to check their own profile first to get some idea of what they want, or whether there’s something they don’t mention about themselves that you want to know). That’s a good way to open a conversation, and if she’s really interested in you, she’ll reply.