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Allergic reaction to the type of lube? Perhaps you should try something free of glycerine, paraben, and also hypoallergenic? Here is a link to some of those:
link

It could be friction so lube up well!

Also, is it possible she may have an infection? Like a bacterial or yeast? That can cause discomfort. If she has any discharge, itching or burning she may want to look into that.

I agree with the previous posters, lube can have troublsome ingredients, rule out infections, and I have had trouble with condoms. Most condoms these days come with lube already on them. Try switching brands and see if that helps. Sometimes the company switches lube so you can have been using something for a while with no issues then suddenly start having a reaction.

It does sound like an allergic reaction to lube.

thanks for the advice. I will look into different lubes.. We already had to switch lubes a while back because it irritated her.

If you are using condoms I would check to see if they have a spermicide on them. I found out the hard way that it wasn't the lube but the spermicide I was sensitive to.

If the problem persists, have her see her doctor and they can test for allergies and sensitivities