What is the lightest 4 wheel walker for a 5'2" 100 lb elderly woman?

PS Her insurance might pay if her MD writes a prescription. However, you can use your insurance only for either a walker or a wheel chair. Depending on your mom's condition, insurance covers wheelchair rental for several month, before they will purchase a wheelchair.

When mom needed one, the pt person recommended a "junior" size, to get through doorways. It has 4 wheels and a fold down seat, which she used often. Now dad is using it. It was durable, and still pretty lightweight.

Make sure about the wheel size. I thought larger would be better, but when mom sits down her feet dangle. Mom is 5ft. "Drive" seemed to be a brand that kept coming up and you can find them at CVS or Walgreens. I bought one with a closed compartment under the seat not a basket, things will fall through the holes.

There are many available, I don't see where you mentioned a price range or a budget, there should be a medical equipment place that you can rent to own or even a lending place that you can check out and return when no longer needed as a temporary like when my neighbor broke his hip and now went back to his cane after healing. This one runs for about $120.00 if this is more what you may be looking for and This is the link to get more details for it, activeforever/nova-getgo-lightweight-rollator-walker
Personally I would go with this one, If she gets tired she can rest on it and also a way to tote things around... Best wishes...

My MIL is 4'6" and 78 lbs. We modified one similar to the fancy ones they sell at Costco for $89.

I heard that 'triangular' walkers aren't as stable as a 4-wheeled walker... perhaps, this is more so for a taller, heavier person. Any experiences with the safety of a 3-wheeled walker?

We can make them more fun. We call my mother rollators "Pushmobiles." My mother is 5'4" and has two -- a heavier husky walker for outdoor walking and a lighter more narrow one for going places. Both of them are by Drive. Both are fairly light, so no problem for a healthy caregiver to fold and stick into the trunk.

My mother-in-law had a bell on her triangle walker and she loved it. It got people's attention without her having to raise her voice, or was just used to say HI when someone walked by.

If you have a traditional fold up walker and the wheels are on the outside, you can remove them and put the wheels on the inside. That gives you about 1 inch more leeway on either side of the walker.

If she is at Independent Living, there is an unspoken competition for who has the prettiest walker. Baskets, a seat, pretty colors are all a status symbol. I would get her a bell and a horn from a bicycle shop. Whoop it up.

My mom needed one and is almost exactly the same size. We ordered a large child sized. The other issue for us, was finding one that was narrow enough to get through her bathroom door. Hers has wheels, and a seat with storage and came in several colors. We got it at a drug store that had a section for medical equipment., but I do not remember the brand name.

Medline has a large variety of walkers with weight range from 5.5lbs-7-8lbs. I would add that when wheels on all fours are desired rollators are frequently chosen, they cost more but also come with seats and other attachments.