Yes. She COULD, in fact, be more ridiculous.
Her mind doesn't work like yours does.
Her mind is a confused jumble of reactions and projections and fears.
As you have probably observed, she isn't consistent.
Some of her statements seem to be (are!) 180 degrees
opposite to other statements.
Discuss with your husband some prepared responses
regarding your upcoming move.
And then stick to them.
Don't take her bait when she throws various weird remarks at you.
She says bla bla bla furniture, you say "We're leaving in January."
She says bla bla bla cell phone, you say "We're leaving in January."
Oh! The asthma issue is a big one.
Great environment, clean air . . . .
Don't try to persuade her that
you'll all be much happier and healthier there.
Just "We're leaving in January."
Possibly throw in something about "Thank you, mom,
for letting us live here while we were getting on our feet.
We'll always be grateful for your kindness and generosity."