Right, I really need some advice on what to do here!
got a text last night thanking me (by name) and my ds (by name) for attending a party for one of the children at his nursery, and thanking us for the lovely gift.
Checked calendar and ds was supposed to be at a party this weekend- I had texted to accept the invitation ages ago, bought a present and then....forgot all about it 
Now, under normal circumstances I would on realising this have texted the mum with profuse apologies and handed the present into nursery today, but now I am not sure if that will embarass the mum, who has sent me this lovely text thanking me for the gift/ our attendance. Is it possible she thinks we were there, and will be embarrassed when she realises we weren't and she didn't notice, or do you think I should text my apologies and hand in the gift. I have even considered handing the gift in anonymously, but don't know if that makes it worse (and puts nursery staff in awkward position) Or should I say nothing and pretend I was in fact there- aaargh!!
Really don't know what to do, so thought I'd throw my predicament to the wise wummin of MN. WWYD???