Is it just the two of you? Or are there more in the household?
What about a lovely breakfast together? We have a tradition of birthday breakfast being the most important meal. It's planned with great precision.
Are there any online classes you could do together? If you drink gin then my friend is doing an online gin class with her dh. Or find one that you would both enjoy. I'm sure there are other online 'experiences ' food related ones?
A spa day - manicure, pedicure, face massage.
A nice dinner with the table all set up nicely.
There's a thing called houseparty where you can get together with family and friends online and play some silly games. We did that at the start of the first lockdown for mother's day. Everyone brought snacks, it was really fun.
A special movie for some down time.
We had my daughter's 30th birthday in the first lockdown but it was when we could meet at a distance on the garden with one household. So I decorated the garden to the hilt for her arriving. It was like a mini festival. We had afternoon tea delivered from the posh Italian. It was amazing and felt like a real treat.
You could set up each room...
Kitchen or dining room set up for breakfast and presents with decorations (you get beautiful paper ones these days)
Bathroom cleaned well and candles out for a nice bath. Bubbles for presents.
Living room set up for spa with fairy lights, music and towels etc. Nice movie on.
Then each room can be changed for dinner or afternoon tea.
Go for a walk if its nice after breakfast, can you go somewhere nearby that is looking fab in autumn right now?
I hope you and your daughter have a great day.