It's back at my moms house, I just haven't had any time really to look at anything else, and she doesn't want to spring for a new speed sensor without knowing if that's going to be the fix or not

I know what you mean, but no, she wouldn't have crawled under the dash to look at anything. And even if she did, I don't think she would've touched anything without asking someone first.
Anyone know where I can find a factory service manual online for this car? I've only seen for newer ones