Well...I'd be more concerned about the bottom rather than the awlgrip. Sometimes stripping, sanding an painting can be a way to cover up blisters. A good surveyor will put a moisture meter on it and do some tapping to see if there is anything to worry about. Awlgrip can cover up some hull damage as well...but if there were glass repairs and done correctly, there really shouldn't be any long term concerns above the water line. Just be sure to take a good look at as much of the inside of the hull as you can. Lots of people just use awlgrip to renew an old/oxidized gel coat or prior paint job or cause they like blue boats better than white . Is it located in a hurricane zone? Is the owner the original owner? What dos the engine room look like? Is the price low vs. other Christina's? All clues about the care the boat has received and if there might be hidden problems or something might have happened to her.
All that aside...if she feels right to you...just get a good independent surveyor and be there yourself for the survey. Good luck!