So, sadly, I've tried this, and had a work colleague who successfully did this many years ago (not through SA, just email).
First, keep "her" talking. Always ask new innocent questions and provide your own vague replies. The more you appear to express interest and "affection" the deeper they think the hook has set.
Next, when she eventually either expresses her love for you and/or starts the set up to beg her hero to save her with cash, that's when you gently introduce some hesitation..."Oh my love, I see how hard this must be for you, but I'm just worried because my friends all tell me this this isn't real. Is there anyway I can prove your situation to them? Can you send me (now here's where you get creative) something I can see that proves it's all real?"
Let her suggest some things, and tell her you like that idea but not sure your friend will accept it.
Them just keep using the "skeptic friend" to escalate your demands. Here's some ideas of stupid stuff to ask for:
1. A pic of her holding a sign with your name on it
2. A pic of her in some stupid position (not naked - just stupid) - like hands on her ears and a banana in her mouth, etc.
3. A pic of her ID and front of her home with the address showing while she wears a purple dress and yellow shoes.
... you get the idea.
It's always "just one more thing, my dear, and I'm sure my friend will be convinced!"
If you really want to fuck with her more, add a pic of you friend - Mr. Benjamin Hill and use a pic of Benny Hill.
Try sending her a pic of a stack of hundreds on your desk as well. Just keep edging her on...
Have fun and keep pushing the limit.
Life is good
The Cat