She might consider seeing a therapist who specializes in sexual issues if she is experiencing mental blocks to orgasm.
She may also just have a very high physical threshold for reaching orgasm. A vibrator could help. Since she was able to cum in the past, using a vibrator to “bring the orgasms back” might allow her to stop worrying about it as much, which might let her cum through other means as well (as long as she doesn’t get accustomed to the intensity of the vibrator). This is sort of like a guy with temporary psychological erectile dysfunction using Viagra to get over the block, and then relaxing and not needing the drug anymore.
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