Does she sail close to the wind?

I always have a hard time with this question, partly because of my limited experience with other boats.  In my opinion, she is average (at worst) in sailing close to the wind.  With a total draft of 3'11" (centerboard down), she isn't a race boat, but she should be able to hold her own against most other similar designs.

Does she tack through 90 degrees?

Close-hauled. Click the picture and look at the tell-tale.

Yeah, I think so.  If its not 90 degrees, its pretty close.  Like I said, this isn't a race boat, so don't even dream of 80 degree tacks.  On the other hand, I know that I don't have to bear off much to get the boat speed up quite a bit.  Frankly, my gps tracks look like they are 90 degree tacks, and thats about as much as I can say about how close-winded she is.  I hope that's good enough for you.  If not, buy a Melges or a J-boat.