First couple of times maybe.

My Nissan SUV got pretty tight and there came a point I would have to move the seat back before getting because my belly blew the horn getting in.

I tried it when I was on the skinny side just to see what it felt like.

Love comes all of a sudden and smacks you in the face.
When it does you will know it.
I felt that way too when I was 18.
I knew absolutely nothing about love.
All I can say is don't rush it just let it happen on its own.

I can relate indeed.

It helped me to gain weight when I couldn't eat very much at one time.

Try to get her to eat a little more at each meal.
If she likes ice cream try a bowl of that right before bed.
She doesn't have to stuff herself or anything like that because gaining weight takes time.
The more she eats the body will adjust to it.
Take it slow.

My old Nissan SUV got pretty tight when I was 420+.
I would have to move the seat all the way back to get in and adjust it up a click or two to drive.

Not really but I buy a lot at one time because I shop for a month at a time.

Jeep JK driver here and the climate/ earth is going to do whatever it wants and to think "man" has any ability to stop it is foolish thinking.
Oh and I used to smoke but quit back in 2014 and yes I did gain a bunch of weight after quitting.