Hi Betty,
The 1851 census does seem to say Moadeath Cornwall, My research hasn't brought up any such place but if you look at the 1861 Census it says Broadoak Devon. This should read Broadoak Cornwall,
My research has given me the following information on Broadoak, which isnt to far from Plymouth where she eventually married William Rider:
Braddock, Cornwall Braddock (Cornish: Brodhek) is a village and (by the name of Broadoak) a civil parish in Cornwall, England, United Kingdom. The village is situated about seven miles west of Liskeard, and five miles south-east of Bodmin. Broadoak parish is rural in character and is well wooded, especially in the north. According to the 2001 census, the parish had a population of 124 increasing to 156 at the 2011 census. The hamlets of West Taphouse andTrewindle are in the parish. The ecclesiastical parishes of Braddock and Boconnoc have been united since 1742. Braddock church is dedicated to St Mary the Virgin: the earliest parts of the building are Norman but an aisle and a tower were added in the 15th century. The font is Norman and there are many good examples of woodcarving in the church: these include the bench ends, part of the rood screen, wagon roofs, an Elizabethan pulpit and two carved panels perhaps of the 18th century. The parish of BRADDOCK (BROADOAK, BRADOC)
http://www.cornwall-opc.org/Par_new/a_d/bradock.php Braddock aka Bradoc or Broadoak (Cornish: Brodhek) is a parish in the Hundred of West, situated about 7 miles west of Liskeard, and 5 miles south-east of Bodmin. There is no village centre as such, the parish consisting of isolated farms, the parish church and the hamlets of Middle and West Taphouse. Since 1837 the parish has been part of the civil registration district of Liskeard. Parish Church The ecclesiastical parishes of Braddock and Boconnoc were united in 1742.
This one has stumped me at the moment, I need help from a much more experienced researcher
Kind regards
Norman