I'd say it's extremely likely to be the right baptism. Don't forget, the date is for her baptism rather than her birth, so as there's no birth date recorded you can't be sure how old she was at baptism, except that the census ages would suggest she was a baby. (and watch out that in the UK we write the date the other way round, so I always type the month name to be sure there's no confusion!).
I wouldn't worry about absolutely exact ages from the census records. It's pretty unusual to find anyone who appears on more than a couple of censuses and is spot on with their age every time! Most people jump a year or two from census to census and some a lot more. In theory it was only the 1841 census inthe UK where ages were supposed to be rounded. I see Ann's age was a round number every time, so she is one of the unusual people!!
Within the same batch on the IGI there are all these with father's name Thomas Jackson, so likely siblings for Ann. Sadly, the vicar didn't go in for mothers name at all
1. SARAH JACKSON - International Genealogical Index
Gender: Female Christening: 28 JUN 1795 Horsforth, Yorkshire, England
2. MARY JACKSON - International Genealogical Index
Gender: Female Christening: 31 JAN 1808 Horsforth, Yorkshire, England
3. JOHN JACKSON - International Genealogical Index
Gender: Male Christening: 21 AUG 1796 Horsforth, Yorkshire, England
4. JOHN JACKSON - International Genealogical Index
Gender: Male Christening: 07 MAR 1802 Horsforth, Yorkshire, England
5. HENRY JACKSON - International Genealogical Index
Gender: Male Christening: 19 AUG 1804 Horsforth, Yorkshire, England
6. THOMAS JACKSON - International Genealogical Index
Gender: Male Christening: 25 MAY 1806 Horsforth, Yorkshire, England
7. FRANCES JACKSON - International Genealogical Index
Gender: Female Christening: 17 AUG 1800 Horsforth, Yorkshire, England
8. HANNAH JACKSON - International Genealogical Index
Gender: Female Christening: 29 APR 1798 Horsforth, Yorkshire, England