Call her for a social game. Really. I'm betting the awkwardness will all fade away.
My partner from last season got bumped to 4.0, and I didn't. Our club doesn't have any other 4.0 ladies, but was thinking of building a 4.0 team with 3.5 players, and a few 4.0s from outside the club. She wanted a true 4.0 team, so she joined another club. We still play social tennis weekly. And my one stipulation is I will not play on my 4.0 team against her team in league play. And next year if she comes back to play for our club it will be with high fives all around.