I've been to Lone Girl twice now. As a restaurant, it deserves exactly 2.5 stars. It is right in the middle of the rating spectrum. It's not terrible and it's not fantastic. It's just sort of there.
Let me say that the service has been very good during both my visits. Very attentive.
I had the fish fry on my first visit. Fish was flaky, in a nice beer batter. Didn't care for the sweet potato fries mixed in with regular, but didn't see any reason to complain. On my second and very recent visit, I had the fish tacos. Meh. Two small tacos served with a big side of bland tortilla chips and some very mediocre institutional-grade salsa.
In the interest of full disclosure, I did not try their beer during either visit. The atmosphere is lively and this is clearly the most upscale dining venue in Waunakee. The prices are not cheap, but there is plenty of new money in Waunakee to support a locally-owned, non-chain restaurant and bar / microbrewery. The question is how long that support will last, given the mediocrity of the food.
The lack of any upscale dining competition in Waunakee may just be the best thing Lone Girl has going for it.