No I wouldn't reduce her milk at all, it's still her primary source of food and where she is getting the vast majority of calories and nutrients, the solid food is secondary at this stage and won't give her as much of what she needs until she's several months older.
I know there is not much time between your two last milk feeds but she doesn't need to have too much in the way of solids in there. Giving solids around 5.30 will still give her a couple of hours before her BT feed which is fine. Just don't panic if she doesn't take much in the way of finger foods or any solids in that last meal. You might want to offer tastes she has had before so for example if she's had puree sweet potato maybe try a steamed sweat potato wedge or an oven baked wedge (which is drier on the outside and easier to pick up). Finger foods should be about the size of an adult finger to give her plenty of space to grip in a fist and have a little bit poking out the top to put in her mouth.
There's no harm in introducing finger foods at the other meals too, either alongside her puree or instead of.
Your routine is lovely - many would give an arm to have that! No need to change nap length until there are signs that you need a tweak. If nights become very disturbed or there is bed time resistance or earlier waking in the morning then I'd post on EASY or naps board if you need support with a tweak. Otherwise just enjoy that Y time you are getting!
