Have you thought about majirel cool cover?
It’s designed to fight off the warmth creeping back through for longer due to oxidisation, sunlight etc.
Is she naturally a 6.3/7.3? Did you use a base 6 with the 6.1?
I did out this formula for you
NB :6
SR 6.11
L/L 0 -20vol
U/C 8 - yellow...