The most common and most likely answer to this crossword clue is the 4 plus 3 plus 3 plus 4 letter word BLEW HOT AND COLD
I've seen this crossword clue in The Guardian
B
L
E
W
H
O
T
A
N
D
C
O
L
D
Buddy explains!
The straight part
We know that "(kept changing her mind" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case (kept changing her mind = blew hot and cold.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.