How long since you have been to Birmingham?
You have to take her to the BullRing shopping centre.
Also the area around the Convention Centre, NIA, Symphony Hall etc. This is a lovely area now, right on the canal, with loads to do. You can see the new huge library that is being built in Centernary Square.
The SeaLife centre in in this area.
Also a short walk along the canal from there is the Mailbox, a fairly new upmarket shopping centre with loads of bars and restaurants at the back, alongside the canal.
You can also see the new Cube buildings which has just been finished, an amazing building (near the Mailbox right on the canal side).
The BBC have their TV studios in the Mailbox as well and you can go round part of the BBC building seeing what is going on.
Also you can pop in the Birmingham Museum and Art Gallery. Even if you you are not that interested in Art it is still a lovely building inside with some interesting galleries in the museum part.