I actually heard that Vitamin E pills can be used for dry vaginas. So maybe u can find something about that, i'm not sure the exact details of it.
Also as inconvenient as it is, ALWAYS use lube in ur case. KY Jelly is very good, and get one for sensitive skin. U can actually buy thin, small lubes and she can keep one in her purse or pocket for spontaneous times. But always use it for now. Her dryness is her body. There will be small things she can do but this is her body. Some are very wet, some are very dry and others vary in the middle. If it persists to bother u greatly tho, never hurts to visit a gyno!! Good luck!
I'm having a similair problem about the wetness issue. ..as of lately. Try getting her to eat more things with fatty acid:
■Omega-3 (fish, flaxseed oil, and some nuts like macadamia,almond,walnut)
■Omega-6 (evening primrose oil and borage oil)
■Omega-9 (olive oil)
- those kinds of foods help women produce more vaginal mucas/lubrication).
Thats what i've been given a few times as advice, looked up on it, and seems to be a very possible solution. I have just started this week putting more of those things in my diet everyday. Already seems to be helping a little, so i'll update you more if interested. Or even try some aphrodisiacs on her side, things high in zinc (ex: oysters) to get her mood flowing. ^_^
Another solution might be to change around how you start/do during sex to mix it up. Get her more excited doing something different and surprising her with new acts...
hope this helps.