i'm sorry about your mom.
i sounds like her life isn't too pleasant.
they should be able to do homecare for steroids. the nurse will start the iv and give the med each day.

your mom's dr should order this and your mom should request it.
driving in her condition doesn't sound very safe. plus it's such a long trip.

i was dx'd in '03 rrms. and i "had had it for some time" per my dr. that's when i first got symptomatic. now i'm spms. i've had some decrease in my strength and mobility but i'm still walking (with aids), driving and i'm independent.
i've never had an outright flare. i'm pretty much stable.

so i think that's a good thing.
ppms is more serious. i'm sorry your mom has it but glad you don't.
try to take each day at a time.
stay strong. you can do it.