Originally Posted by leroy_sunset
Seems easy to me.
1. If the ball is traditionally "yours" (forehand/backhand on the ad side, forehand on the deuce side) and you call "mine" then your partner should let you have it. Period.
2. If your partner calls "mine" on an overhead, it's theirs. Don't run back to ensure coverage, because you're going to lose on the next shot due to being out of position. Period.
Keep practicing and trust your partner. Eventually you'll get used to who is most comfortable with what shot. Then the "mine" and "yours" will be more consistent. Personally, I say "yours" a lot more than "mine." But if the ball could be played by either of us, I feel that someone should always say something.
Also, you mentioned it as an example, but you say "she's ad, I'm deuce." Ad player takes most of the overheads. Ad player takes most of the middle balls. So who is "taking" balls they shouldn't be taking?
It sounds like you play "Forehand takes the middle." Nope, not me. Crosscourt takes the middle, except that the player in front always has priority on a ball she wants. Players are expected to poach/volley with their BHs, and there is no excuse for a 4.0 doubles specialist who has to lay off of a poachable ball just because it is a BH volley.
Funny thing. I played with a different lady today, one I had never partnered with before. No communication problems. If she couldn't get a lob, she immediately called a switch. I crossed behind her and took them out of the air. I don't think a single lob went unplayed.
Thinking back on the other partner, I think the issue is a lack of trust. If a lob goes up to you and you say "Mine!" and then the ball bounces behind you for a winner, that is unacceptable. It means you badly misjudged the ball. It makes it hard for me to trust your judgment the next time.