So about two weeks ago I met this HB9 in the airport a few hours before this flight to Spain, used a situational opener, lots of IOIs at the beginning but after a while the tiredness got to me (I had no sleep for over 30 hours at this point and was also feeling pretty sick because of it) and I just couldn't keep the game up anymore. Nonetheless she actually kept the conversation going although I couldn't keep my enthusiasm up and all I wanted at this point was to go to sleep. We sat together on the plane, exchanged numbers and then we went our own ways. Overall, good impression at the beginning which changed to bad towards the end

.
3 days later, I sent her a text "I just saw a purple mini and it reminded me of you!

Have you found an awesome present for your aunt yet? " She drives a purple mini and she was going to her aunt's birthday in Spain + a 3 week long holiday!
2 days after the text, no reply but FRs me on facebook. 3 days after that I accept her.
I'm unsure what to do next since I don't want to text her again if she hasn't replied to my first text. Should I wait and see if she gets in touch with me when she returns to the UK? I'm inclined to think that she hasn't texted me because it wouldn't be a free text from abroad but that still makes her sort of stingy, right?
Any suggestions appreciated but I'm inclined towards just nexting her!
I think you should text her a few more times. Women are real fickle when it comes to texts. she may not of got it, or may have intended to respond but forgot, or it may be logistics like you theorized. I've had women who ignored 4 or 5 texts in a row and I still fucked cuz I was patient. In your situation you don't have anything to lose by breaking some rules 2 or 3 days later and texting again. The rules about seeming needy apply to guys who , collected a number from a girl they most likely will see again in the same area in the future