Looking fat but still ready for action. Her card's info says:
JIOJ-EN005:
My Plump Pony Pal Mistress Mare-velous
LIGHT / Plump Pony Pal-Type Synchro / Level 7 / ATK 0 / DEF 2600
1 Tuner + 1 or more non-Tuner "My Plump Pony Pal" monsters
Cannot be changed to face-up Attack Position. Once per turn, when a card effect would change a face-up "My Plump Pony Pal" Synchro Monster you control to face-down Defense Position: Negate the activation, and if you do, destroy it.
Rare