Slipping transmission in an 87 Corolla

My daughter who lives rural PA and far from me has asked her old dad for advice, so I’m writing for any help I can get. She owns an 87 Corolla with 147k miles. About 2 months ago, her boyfriend drove the car over a concrete highway median. Except for burning lots of oil, she’s never had a major problem with the car. A couple of weeks later, she took it in for repair. One wheel was replaced along with the oil pan and a crossbeam member under the car. The front end was aligned and new brakes on the front were put in. The mechanic put in what he called a “donut” that was to stop

Someone’s sinking a lot of money into a 22 year old car, and it sounds like it needs even more.