The Church of Latter-Day Saints (Mormons) find it important to be able to baptise their ancestors posthumously by proxy and thus make sure that they are eligible for heaven, where their family group will be complete, so they have digitised or scanned loads of records of all sorts, such as births, banns, marriages, deaths, burial maps, vestry books and other records from churches of all denominations, censuses, school registers, obituaries, biographies, work records, and so.
However, they can only digitise what they can get hold of, and they don't have access to absolutely everything. If you can find a list of the sources they have, you could possibly check whether they have any records at all from the date and place where your mother's events happened.
I believe they will even accept suggestions of things that someone would like them to digitise, but it may be some time (or never) before they get round to it.