My mother will be 85 yo in November and stands about 5'3". She cannot stand long enough to "wrangle" her way into the passenger seat anymore and I can no longer assist her getting in. I have searched the internet with every phrase I can to find something to help lift her manual wheelchair up high enough so she can slide over into the car seat. I need to find either a manual wheelchair that has the capability of raising up to the proper height by a lift or on its own.
I'm so sorry, I know you are only trying to help your mom. I found this link, I hope it's helpful.
www.lift-aids.com/power-transfer-seats.aspx
www.arjohuntleigh.com.au/products/patient-transfer-solutions/passive-floor-lifters/maxi-lite/
www.bruno.com/products/valet-seating
www.hurt-auto.com/swivel-seat
www.hurt-auto.com/lift-up-device-to-transfer-a-person
www.takealonglifts.com/
www.proactiv-gmbh.com/rigid-frame-wheelchair_lift.html
There are a lot of lift videos on YouTube. That’s where I found this one.
Does her wheelchair have the removable arms, so that, once level with the seat, the left arm of the wheelchair could be removed you or someone else from inside the car, then she can scoot over on a slide board?
If so, then I'd look for just a lift, but preferably one that the wheelchair can be rolled up onto. I've seen lifts advertised in Harbor Freight ads, but they don't have sidearms.
Do you know of anyone who could fabricate them? Or have you contacted assistive device companies?
Could you use something like this?
https://www.ride-away.com/wheelchair-lifts-ramps/