It is privately owned but open to the public:
http://visitwoods.org.uk/en/visit-woods/Pages/large-wood-map.aspx?wood=19921&site=Calfhay-Farm#.UBEbabRfF8E so you could go and have a walk round and take some photos - try and find where your Mum was born.
Also, in the 1871 census for the parish of Leigh, there are:
2; Calfhay Farm; Thomas; HOUSE; Head; Mar; 56; [1815]; Farmer of 275 acres emp. 4 labs; Symondsbury; Folio28 p1
2; Calfhay Farm; Honor; HOUSE; Wife; Mar; 56; [1815]; ; Symondsbury; Folio28 p1
2; Calfhay Farm; John; HUSSEY; Son; Un; 31; [1840]; Farmers Son; Swyre; Folio28 p1
2; Calfhay Farm; Martha; HUSSEY; Dau; Un; 23; [1848]; Farmers Daughter; Marchwood; Folio28 p1
3; Calfhay Farm Cottage; Charles; MAJOR; Head; Mar; 30; [1841]; Ag Lab; Catstock (?); Folio28 p1
3; Calfhay Farm Cottage; Jane; MAJOR; Wife; Mar; 35; [1836]; ; Yeovil Somerset; Folio28 p1
3; Calfhay Farm Cottage; Mary Ann; MAJOR; Dau; ; 10; [1861]; ; Leigh; Folio28 p1
3; Calfhay Farm Cottage; George Albert; MAJOR; Son; ; 7; [1864]; ; Chetnole; Folio28 p1
3; Calfhay Farm Cottage; Charles James; MAJOR; Son; ; 6; [1865]; ; Leigh; Folio28 p1
3; Calfhay Farm Cottage; Elizabeth Jane; MAJOR; Dau; ; 4; [1867]; ; Chetnole; Folio28 p1
3; Calfhay Farm Cottage; John Giles; MAJOR; Son; ; 1; [1870]; ; Chetnole; Folio28 p1
3; Calfhay Farm Cottage; William Samuel; MAJOR; Son; ; 3 months; [December 1870?]; Chetnole; Folio28 p1
5; Calfhay Cottage; George; CURTIS; Head; Mar; 27; [1844]; Ag Lab; Batcombe; Folio28 p1
5; Calfhay Cottage; Charlotte; CURTIS; Wife; Mar; 27; [1844]; ; Chilthorne; Folio28 p1
5; Calfhay Cottage; Frederick George; CURTIS; Son; ; 3; [1868]; ; Batcombe; Folio28 p1
5; Calfhay Cottage; Annie Emma; CURTIS; Dau; ; 1; [1870]; ; Leigh; Folio28 p1
5; Calfhay Cottage; James; CURTIS; Father; Widr; 74; [1797]; Pauper; Batcombe; Folio28 p1
9; Calfhay; Stephen; HOLT; Head; Mar; 60; [1811]; General Servant; Minterne; Folio28 p2
9; Calfhay; Maria; HOLT; Wife; Mar; 54; [1817]; ; Hermitage; Folio28 p2
9; Calfhay; Mary Ann; HOLT; Dau; Un; 17; [1854]; Glover; Leigh; Folio28 p2
9; Calfhay; Jacob Robert; HOLT; Son; Un; 15; [1856]; Farm Servant; Leigh; Folio28 p2
9; Calfhay; Lydia Frances (?); HOLT; Dau; ; 11; [1860]; Scholar; Leigh; Folio28 p2
From this website:
http://www.opcdorset.org/LeighFiles/1871Leigh.htmI hope that helps.
Jack