As long as she doesn't suckle herself raw, she's fine
Our 3 girls:
Stumpy: Adopted her at 7 months old, she'd been hit by a car, and was pregnant, but lost her babies in the accident
Lily: Adopted at 3 months old, very shy and frightened, possibly semi-feral
Smudge: Fostered/adopted by us at about 4 weeks old, very sickly, but human reared
When we first got Lily, she comfort suckled off Stumpy, even though she was too old for that, and wasn't getting any milk. Stumpy didn't mind, and it helped Lily. Lily grew out of it within about a month or so.
Smudge we think was found at about 2 weeks old, bottle fed for 2 weeks, then dropped at the shelter where we took her. Despite being raised by people from almost birth, she's not a suckler. She used to nibble and almost "kiss" DH's nose, but she grew out of it.
How old is Kisa May?