So I was in first seat and dealer picks up and goes alone in hearts. I held 1 trump

and

. So I lead the diamonds and it gets trumped of course. On 3rd trick I discard my

to indicate to my partner I have clubs covered.
My partner in all her wisdom holding

and

decides to play one of her spades. Caller had

and a low spade and got the loner because my partner is a fool. She then had no idea why I was mad at her and for the life of me I couldn't get it through her thick head. She should discarded

on same trick I played my ace.
It amazes me how somebody rated almost 2000 on euchre 3D is this stupid