On the face of it, this seems an unlikely claim as there are no baptisms in the name of TOMS in the Combe St Nicholas [CSN] registers. However, there was a TOMS presence in Chard amongst Non-conformists, with John TOMS the ironmonger, stationer and subsequently postmaster, who joined the Chard Baptist Church in 1831 when aged 42, and raised children of two marriages there. He gave his birthplace as Bishopsteignton, Devon.
The only TOMS link I've encountered in CSN records is the 1821 marriage between Aaron TOMS of Drayton and Hannah WILLIAMS. I can't check details on the PRs as my fiche-reader is currently awaiting a new bulb, but Richard & Hannah WILLIAMS presented a daughter Elizabeth for baptism in 1790 in CSN and, amongst others in the following period, a daughter Hannah in 1799.
On 04 Oct 1791 John TOMS of Isle Brewers married Elizabeth MUNCKTON at Drayton by licence and they appear the likely so-named parents for Aaron baptized 1798 at Curry Rivel. In 1851, at St James Clerkenwell, Aaron claimed Drayton for his birthplace and his wife Hannah claimed Combe St Nicholas. It's possible that Elizabeth TOMS was born at CSN but baptized at her father's place of legal settlement or elsewhere. I'd be inclined to widen the search to include the above mentioned parishes: also, to take on board the possibility that Elizabeth TOMS may have been born before, or very early in, her parents' marriage.
One other point: have you ascertained the marital status of Elizabeth TOMS in 1811 in case she might have been a widow?
Happy hunting!
Update:
It appears likely the John TOMS referred to in para. 1 above might have been the junior; and possibly one of 15 children born to the gentleman of the obituary below. Source: 'Chard Baptists' by Malcolm Bonnington, 1992 ISBN 1 870649036.
Bath Chronicle and Weekly Gazette - Thursday 30 July 1829
At Chard, July 21, the Rev. John Toms, nearly 30 years pastor of the Baptist chapel in that town. He preached twice on the preceding Sunday, and while returning home from chapel was seized with apoplexy, of which he expired in forty-eight hours.