My girl has gained from 225 to 320 over the past year of us being together. She’s 5’4, so a bit taller than yours. Just keep a large variety of food and drinks around them 24/7 and they will grow. Also make her feel sexy and beautiful every single day. Fuck them hard and to orgasms every time you have sex. Buy them new clothes as often as you can afford. And encourage them to stay sedentary. I got my girlfriend a switch 6 months ago and she hasn’t left the couch since. While I’m at work, all she does is game, order food delivery, smoke weed, eat snacks, and goons till I get home. Then I get home with fast food or take out, stuff her till she can’t move, and fuck her to sleep. Provide them the ultimate hedonistic pig lifestyle, and they will happily explode