Mary and the Christian Life by Amy Welborn was published by Word Among Press in 2008.
The small, simple book has been out of print for a couple of years, and as I did with The Power of the Cross - am tossing it up on the ‘net for free download.
It’s just a .pdf – no specific e-book format or anything. But you can probably find some device on which to read it, if you like!
(There are some new and used print copies left on Amazon - priced higher than the original. But, as I said, you can download it for free at the link above, or read it on Scribd here.)