Is it possible to loose muscle memory?

Me and my grandmother were rehearsing for a wedding and I took a step before her and (her arm was wrapped around my arm)she pulled me back a little, I was very upset and my heart dropped,I have been doing mma for a couple years and got very good at it I am worried that I have lost all my skills I worked so hard for... show more Me and my grandmother were rehearsing for a wedding and I took a step before her and (her arm was wrapped around my arm)she pulled me back a little, I was very upset and my heart dropped,I have been doing mma for a couple years and got very good at it I am worried that I have lost all my skills I worked so hard for is it possible or am I overreacting,how can a old lady half my size pull me back a little,how did I go from outs grappling high level fighters to getting pulled back by my grandmother?
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