Yeah, she's stressing herself and preventing herself from finishing. Try having a few glasses of wine beforehand with a nice dinner to relax her, give her a massage and transition to using your hands and oral. Make the whole night about her having a good time in general, and see if relaxing and not making it all about sex can help her overcome the roadblock.
Alternately, tie her to the bed and jam a black 10 inch vibrating dildo in and don't let her go until she cums.
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