My prefix proved a girl's rank.
My infix receives your thanks.
My suffix is grey and healthy.
My whole brags the wealthy.
3 Answers
I think this is
PEARL
My prefix proved a girl's rank.
PEA is the titular device used in "The Princess and the Pea" to prove the princess' status.
My infix receives your thanks.
EAR is how one would receive the words "Thank you".
My suffix is grey and healthy.
EARL grey tea is generally considered healthy.
My whole brags the wealthy.
PEARL is a luxurious material often sported by the rich.
You are:
STANDOFFISH
My prefix proved a girl's rank.
A female saint is usually given the honorific STA when their name is used in place names and churches (derived from the Italian, 'Santa').
My infix receives your thanks.
To "DOFF one's cap" is a gesture which involves removing headgear as a sign of respect or appreciation. If somebody says 'thank you', you might bow your head or doff your cap in response.
My suffix is grey and healthy.
FISH is a grey/silver-coloured food rich in many nutrients, usually recommended as a component of a healthy diet.
My whole brags the wealthy.
Somebody who is STANDOFFISH might consider themselves as superior to others, thereby not wishing to associate too closely with people who are not of the same social standing as them (a status which is often governed by how wealthy one is).
A little bit of a wild guess, and maybe only a partial answer
I think it could be:
opulent
My prefix proved a girl's rank.
OP could be short for Opposite which is a volleyball position (I think)
My infix receives your thanks.
Not a clue. Pule is a word, but it means to whine or whimper.
My suffix is grey and healthy.
Lent -> Ash Wednesday -> Grey...
My whole brags the wealthy.
Opulent: Possessing or exhibiting great wealth.