How can I find out if the Church has a record of a living baptism? How do I get it on her FS record?

I am wondering if my husband's aunt was baptized when she as an eight year old. All of her brothers and sisters before her and after her were baptized when they were 8 years old and I assume she was too. If she was baptized at age eight, how to I get it to show on her FamilySearch record? We won't need to baptize her in the temple if she had a living baptism.

Lottie Elizabeth Staggie (LTMN-7PK); born - 8 August 1918, Ucon, Bonneville, Idaho, United States; married - 1 July, 1937, Bonneville County, Idaho, United States; Lawrence Richard Waterman (L6DP-QW9); died - 15 July 2014, Sweethome, Linn, Oregon, United States.