Any suggestions for an effective bug spray?

My daughter gets eaten alive. She was out catching fireflies for 30 minutes last night and I have counted 23 bug bites on her legs.

Nothing works! I have been looking for the last three years and cannot find a solution. I have tried every commercial spray or lotion out there, including the kinds with DEET, as I might as well have been spraying water on her.

I have tried natural repellents with lemongrass, lemon eucalyptus, citronella, peppermint, geranium and cedar. The most recent one (Herbal Armor All Terrain) seemed to help twice, but last night it obviously didn’t do a thing. I have spent all morning looking for other natural options, reading ingredients and reviews.

I am willing to try making my own. Most recipes I have found suggest 1 part essential oil to 10–20 parts carrier oil – so I would be buying a whole bottle to use only a few drops and I can’t really afford to do that just to experiment until I find the right one. I’m happy to pay if I know it works.

I am at a total loss and I feel so bad for her.Any help?