Hello, I'm a mid-aged lady-kid and I had a heck-uv-a-time getting my GTS 250ie on AND off it's stand. Finally my friend told me, "don't hold the brake on when trying to put it on the stand or take it off" just brake after it has rolled off the stand. All by standing next to it.
I cannot believe how much of a difference this has made. Sometimes I can sit on it and roll it off it's stand, but it's an effort and I'm in this hobby for FUN!
However, I also have a 125cc Buddy, and the weight difference is tremendous after I got used to the Vespa 250.
I will likely list my Vespa 250ie, Giallo Lime with custom painted Givi topcase and lots of extras - JUST because it's harder for me to manually manipulate. It's a dream to ride and much easier and more comfortable than my Buddy, but I have Horrible wrists and not much strength, so the 125cc will be best for my declining strength.
I will GREATLY miss my Vespa, and as long as I drag my heels about listing it, I'm not missing it at all as it's sitting out there in the garage looking FINE.
The thought of an LX 150 crossed my mind, but it's a LOT heavier than my genuine Buddy 125cc, and the Vespa 150 is, from what I've read, one of the most sluggish scoots because of it's weight. If she can handle and get used to the 250ie weight, you both will have a TON of fun. I'm not sure she'd be happy trying to keep up with you from a 150-standpoint.
If you're on the freeway, don't get a 150. It all depends on the roads and speeds you want to travel.
good luck!