I am basing my comments on the fact that your child is 12 so Y7/8...
TA is about 1300 pupils (7 forms in each year). Each form is their house. Pupils ideally stay with the same from tutor all the way through school. They set the children in from Y7. In September they taught the children in their form groups rather than in sets. Catchment is 50% from Wem, 50% from the outlying villages.
SJT is about 700 pupils. They now set the children. Two years ago they announced to the year 6s that they didn't set and by the Sept they had changed their mind! In Sept they taught their children in their English set rather than form groups. Catchment is 90% Whitchurch. Remaining children mainly come from Prees, Lower Heath or Tilstock (10 pupils or fewer from each school). Being in Whitchurch means the other local primary schools are in Wales or Cheshire so there are only the 3 village schools (and the junior school in catchment).
BB is huge. The newish head has changed a lot of things and I am not sure that many of them were for the benefit of the children.
If your DD is academic then she should be OK whichever school she ends up in. What are you looking for in a school? Could try for Newport Girls High. There is less competition for places for a mid year transfer.
Shrewsbury schools are a mixed bag. Depends which school would be in catchment.
Abraham Darby in Telford is good.
How about Stafford?
The Welsh villages close to Whitchurch would give you Penley as a secondary. Cheshire West would be Bishop Heber in Malpas. Malpas is a nice village. Chn, like at TA, come half from the village and half from surrounding villages for both Penley and Heber.