to keep close to her old design try any of these - or put in Neg to reduce chance - SFW/NSFW
may need to add 3d, or realistic, in neg for certain 2d/anime styles due to having more 3d image training - or lower weight for less influence -
Pony XL TW - is Harrietxl,
face/body
Harriet, blue eyes, black hair,
very short hair, or very short bob cut, or ,very short hair, blunt bangs,
skin tone may go back and forth between fair and tan
is tomboyish, and lightweight, so 1boy in NEG for certain styles may be needed
Outfit
long sleeves, coat, black gloves, jewelry, pantyhose, shoes
coat is multi-colored/black and white/- patterned coat, - may be the best option
suggest earrings, in NEG