In the Sweet Spot, you're able to buy food, try that. :)There's currently a bug that the character may not appear, but reloading the game should fix that.
and how do I get wg and preg and hyperpreg?
Her growth is reliant on what you chose for Renée. For the other two options, it's based on a choice you make during her first intimate scene.
but I chose wg to reene and I don't gain weight
It's Artemis that will gain weight if you chose that for Renée. :)