You're not alone. For the first time ever I didn't go and see my mother on MD this year. Daughter had arranged something for me and I couldn't easily fit it in. Did feel a bit bad at first, but then I asked myself why? For a start, she hasn't a clue it's mothers' day, so it's not as if she's going to be upset, and whatever flowers etc. I take in, she will take only the most perfunctory interest. I went on the Monday instead and it made not the slightest difference to her.
Re flowers, this year (and last) I actively discouraged my sister in US from sending expensive flowers that will not really be appreciated for more than a second or two - sister is not exactly rolling in money. Told her I'd take a little ready-made posy from M&S for her, instead. Elder sister now sends one of those 'flower cards' which are very pretty and maybe even better than an actual bouquet, since someone with AD can hold it, look at it and read the sig. over and over etc.
Also, I don't know about anyone else,but I have taken several vases into my mother's CH - almost without exception they have either disappeared or been broken. Not that I'm blaming staff - it's Kleptomania Central there. But that's another reason to take just ready-made little M&S posies now - they don't need a vase.