How about making a reservation at the GF for the tea. Let them know it is your mom's birthday and they will do somehting special. When you arrive you will receive a rose.
When my mom booked my tea at hte GF, without me knowing, she mentioned it was my birhtday. Right before the dessert course, they announced that is was "princess Jennifer's birthday" and proceeded to give me a tiera and a special cupcake.
I would do the tea at the GF over any dinner again.