seeing you haven't met yet, and even if you had met her there is a possibility that you could be scammed, so you should be cautious when you're asked for money
avoiding you for what ever reason could be a warning sign, thou maybe she doesn't have the money to go online ? helping to pay her moms hospital bill ?
yes ielts is expensive, probably the same price as the uk, over £100, which for many filipinos is 2wks pay.
you should go and see her asap, or help her this once and ask for a copy of the ielts cert, if she doesn't give it you, or ask for more cash