if you are supervising a solo does that count towards the 25%?
I really don't see how by any stretch of the imagination that supervised solo can be regarded as flight instruction.
Solo flight is when the student is the only person on board, so there cannot be an instructor who would meet this derfinition:
to whom they have provided more than 25 % of the required flight instruction
The 45 hours has already been broken into its constituent parts to determine 6.25 hours i.e. 25 hours dual instruction; 10 hours supervised solo and 10 hours any other flying.