How has Stella changed since Blanche last saw her?

Blanche comments that her sister has put on a little weight.

BLANCHE: God love you for a liar! Daylight never exposed so total a ruin! But you--you've put on some weight, yes, you're just as plump as a little partridge! And it's so becoming to you!
STELLA: Now, Blanche--
BLANCHE: Yes, it is, it is or I wouldn't say it! You just have to watch around the hips a little. Stand up.