Getting my girlfriend into feederism

my girlfriend recently has put on a little weight and she is starting to get a little bit of a belly and I love it so much. Ive been showing her lots of affection towards her belly and telling her just how much I love it. Shes a total foodie and loves to eat, and I decided to ask her what her thoughts are on gaining a bit of weight. she said sure but only a little bit. hopefully I can get her into it and convice her to gain more. How should I play this to get her on board with it and maxamise this chance