It's difficult to make recommendations to you without knowing what part of the world you're in. Some e-ink readers are more difficult to purchase than others if you're in North America, for example.
I would strongly recommend that you stay away from PDF as much as possible if you're going with a 6-7" device.
SD Card slots are harder and harder to come by these days, but unless you have a lot of PDFs or cbr/cbz (manga, usually) space won't matter. I would strongly recommend the use of a laptop (if you have one) and Calibre to load up your mom's e-reader.
I will state that I'm a Kobo fan and love my H2O. A Clara HD or a H2O v2 might be a good fit for your mom.
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