I wasnt drunk but this woman keeps telling my mum i was? what should i do?

so yesterday i had a party, but since i didn't get any sleep the day before i was asleep for most of it (yes i know, im such a party pooper:p) well anyway, my next door neighbour complained and asked to speak to me since my friends were being loud, obviously being suddenly woken up i was abit puffy eyed and droopy, so my friend was pushing me toward the gate to talk to her, and this lady thought i was drunk? and i told her this and shes telling me not to make things up and now my mums in a huge mood with me:/ what shall i do?