You can sell the furniture with the house if the buyer is interested - I know I really wanted the couches that were in this house when we offered on it.
The house has to be CLEAN for showings - it has to look clean and it has to smell clean. If you can get to it, doing something as simple and cheap as replacing electrical and plumbing fixtures can really make a house look upgraded instead of dated (no offense, but I’m going to assume your mom’s house looks dated since older people’s houses almost always do). Maybe get someone else’s opinion on how the house shows - you might just see Mom’s House, not a house on the market.
If you can afford it, hire your own inspector to inspect the property and give you a written report (that can be made available to serious buyers). We had a set of buyers who brought in their own inspector, and it was a scam - they got what we suspect was a family member to pretend to be an inspector and came back with ridiculous, non-existent problems with our house to try to bring the price down.
Get familiar with the real estate market in the house’s area if you can - you should know what is realistic as an asking price and how long things take to sell and what comparable houses look like. I went to lots of open houses when we were about to sell our house, so I knew what was going on with the market.
Your agent should give you some advice like whether or not to do any repairs or updating (some things will make a house much more saleable, other things really don’t matter - she should know the difference); she should have open houses quite frequently; she should be in contact with you frequently, and she should be available to you almost 24-7 (or calls returned promptly). She makes money when you sell - if she’s not serious about a sale, you need to cut her loose and get a new agent, but that’s sort of jumping the gun.