Don't ever get into her trap...Invitation letter are NOT for sale..your prospective employer will be the one to give you for that and process your visa ,foreign expert certificate and others for you to work legally here in CHina.... not the recruiter, unless she is the owner of the school/or your prospective employer!..Most of the recruiters ask money, so consider this as a scam...you can find a good job without them...just be careful!!...Good luck for your job search!