My girlfriend's friend is sexually flirting with me

I kind of feel awkward right now because I think my girlfriend’s old friend is flirting with me. Worst part is that they’re not even close. The girl added me on Facebook and started sending me suggestive messages. Something like she can take me to space with her skills in bed. Sex jokes basically but then she says there’s no malice to whatever she’s saying. She’s really pushing me to the edge. I already consulted my girlfriend about this and boy is she mad at her. I even asked my girlfriend if I could block this girl. I have so much respect for Thai ladies but for my girlfriend’s friend? Not so much. What else can I do about this?