I "came clean" and finally told my mother that we're homeschooling.
In some ways it was both better and worse than I thought it would be.
She doesn't agree with it, but said she'd be willing to learn more
about it and agreed to read through any websites or articles I'd like
her to read through.

The rest of it though..ended up basically being an attack on my
husband and lecture ending with yet another plea from her for me to
divorce my husband. SIGH. Oh well. At least she knows the truth now.