Sitting south I led 10♣. Partner played A♣ and switched to ♦K. I followed with 2♦ and partner continued with ♦A.... curtains.
My partner is not an experienced player and has been taught to follow suit with count and discard with Mckenney. She regularly attends BIL classes, is very keen and improving and I hope I am helping her. I am not a qualified bridge teacher so hesitate to impose too much my own concepts about signalling. We have did a conversation a few days ago when I said I thought attitude at trick 1 was better and fortunately most of the time an attitude and count signal was the same. I also told her that normally I only give a suit preference signal when I think she would not otherwise know, otherwise it is count.
This was the chat after:
didnt u play a 4 jack?
wackojack: y
wackojack: my raise showed 4 so small was for a club
:i wanted count
wackojack: if i played high you would return a !c?
i wouldnt return what i did
wackojack: i must have 4 for my raise
: sry jack yr level of thinking is higher than mine...a need more time for that.
Your views? Shall I leave it to the bridge teachers?

Help

1♣ DBL P 1♥
2♦ 3♠ 4♦ 4♠
5♦ 5♠ P P
P