pianistimo, I haven't done this sonata, but in general, I am always messing around with Mozart's ornaments when it isn't exactly indicated how to play them. (I sometimes hear artists playing them differently on recordings, too.)
My philosophy is, try every way the ornament might be played, and play the whole line to see which sounds smoothest or most appropriate to you. I have added little "passing tones", or decided on an auxiliary note vs a principle note just on the basis of what sounded more Mozartian to me. (And let's face it, Mozart and his contemporaries embellished all sorts of things all the time!)

Teresa