Sorry about your mom. I don't sew to make money so I am not the one who can answer your question. If you think you would enjoy learning to use your mom's stuff that is justification enough for me for you to keep everything
Plus I can see where your mother would smile looking down at you using her items
I completely understand if you could use the money from the sale of the items as well... but I don't know that selling could be done in a timely fashion. In my experience eBay is great for established sellers who have put in the time to build a customer base... I love buying from some of them
But if a seller has no reviews and its their first items to sell... I won't ever buy from them (again - I had a bad experience in the past)
good luck