There are various avenues you could try.
First, do you know for a fact she was born in Castleton as you say in your first sentence?
It is not necessarily so just because she got married there.
Have you seen the actual entry in the register, or is there an application for a marriage licence that places her there?
Secondly, remember these were the baptisms recorded, and not the births. Usually babies were baptised pretty soon after birth, but not always. Sometimes they could be a few months or even years old.
Thirdly, there ARE Tym/Tymm/Tymme families in the Castleton registers in that period.
It may be her baptism was missed for some reason.
For example, a Robert and Ellen Tym baptised at least 3 daughters there - in 1690, 1693, and 1696.
You could try and find Robert's marriage, see if there are gaps in the baptisms of their children, or baptisms of any other children nearby.
Fourthly, I found these children of Henry Nall and Maria at Castleton - Robert in 1721, Henry 1723, Maria 1725, Matthew 1727, and Martha in 1730. Have you found any others? I would have expected a child before the one in 1721. Sometimes the wife returned to her home for the birth of her first child. Perhaps somewhere other than Castleton?
Fifthly, have you traced Henry Nall's parents? Are any of the children named after them? It's a good possibility, as they name a son Henry and a daughter Maria, that the names of their other children are also family names.
And lastly, have you looked at wills? These can be a great source of information.
There are several Tymm wills on findmypast (Derbyshire came under the Diocese of Lichfield. The wills from there are now at Staffordshire Record Office, but are on findmypast).
I can't see one for Robert Tym - he seems to have died in 1744 in Castleton, but if you can find his birth, there may be one for his father, who may name his grandchildren. There are quite a few Tymm wills on there.
The other wills to look at are the Nall ones. If you know Henry's father, and the date of his death, you could look for that one.
Depending on how much you want to find her, it's often worth looking at the wills of any other possibly members of the family - bequests can be made to daughters in law, nieces, granddaughters etc etc. Bachelor uncles and spinster aunts were often good at leaving bequests to a wide range of family members.