Hi Danny, i'm new to this forum but i would probably go into chat when she is on line and start a conversation with 'checking out my pics are we
hows it going?'Its flirtatious, states the obvious and also ends with a general question. Don;t put an x t this point.
LEt the conversation develop. i would also suggest closing the conversation at 5 mins into the conversation like 'i've got to go, msg me tomorrow x'
This puts you in control and tells her you are busy and that she needs to find time for you tomorrow when you come on line.
Only use this 'x' once at the end of the conversation. When she says 'ok' see if she also leaves a 'x' as this will imply she has interest.
Please note, facebok chat has the option to appear off line to specified contacts, so if you want to stay on fb chat after you have closed the conversation, its safe to stay as long as you have specified you are appearing off line to her
Hope this helps. Other PUA feel free to comment