It's right, I see, for her to be better off (6)
I believe the answer is:
richer
'be better off' is the definition.
(better off means with more money)
'it's right i see for her' is the wordplay.
'it's right' becomes 'r' (common abbreviation).
'see for' means one lot of letters go next to another.
'her' becomes 'cher' ().
'r'+'i'+'cher'='RICHER'
'to' is the link.
(Other definitions for richer that I've seen before include "Wealthier" , "More affluent" , "More well-off" , "Having more wealth" , "More wealthy" .)