With Mothers Day coming up here I was planning on sending my T a quick e-mail to just let her know I was thinking of her and that I appreciate her being a mother figure to me. We e-mail often so the issue is not whether to send an e-mail or not but whether the content and sending it on Mothers Day is ok? She is fully aware that I see her as a mother figure and is completely ok with this. Just not sure whether acknowledging it so formally on Mothers Day is normal/acceptable.

Anyone else done this or has any opinions on this?