Mandy,
Barbie is right -- a trach is a big deal. And I too hope you meant to type BiPAP!
Is this a hospital experienced with ALS? What hospital is it?
If she "looks great" but needs help with mucus, she's like 95% of the frequent PALS here on these forums, most of whom don't have (and I don't think most are considering) a trach (tracheostomy; I'd look it up on line). We talk about a lot of ways to reduce and get mucus out.
A trach is for people who are going to die if they can't take in and get out more air. Do you know anything about your mom's lung function? Was she on BiPAP before the hospital? If not, it would be pretty unusual for her to suddenly skip past the months-to-years of BiPAP that you usually go through before possibly needing a trach.
If she is stable in terms of moving air, (ask what her sats are, look and see what her pulse and BP are), I wouldn't agree to anything until you have more facts. Ask for a respiratory therapy consult about the mucus and coughing. Is she drinking? Give her some pineapple juice through a straw if so, demand a heated humidifier and a Cough Assist trial starting at the lowest setting. Make sure she is positioned in as upright a position as possible at all times.
Let us know if you need help finding a pulmonologist in your area who at least if s/he doesn't have privileges wherever your mom is, can recommend someone who does, so you get a second opinion.