to keep close to her old design try any of these - or put in Neg ( when altering appearance/outfit)
may need to add 3d, or realistic, in neg for certain 2d/anime styles - lower weight for less 3d influence - 0.8 between 0.6
PonyXL version may need a XL VAE as a 1.5 VAE may cause issues - Images "may" be - at or past 1024x1024 or 832x1024 - Sampling steps past 30 - this can work with any model that is PonyXL or was merged/trained from it - DOES NOT WORK WITH 1.5 checkpoints - TW is isabelaxl,
For appearance
Isabela, long black hair, brown eyes,
mole under eye, results may vary - inpaint may fix this
has the ability to create flora/plants
for outfit
purple dress, jewelry, floral print, frills, purple hair flower,