Surgery sucks but it’s worth it.
I blew mine in January ’93 and had it reconstructed within a few days. I made a couple runs that March but they were on East Coast groomers. I was cleared for full activity after 6 months. By next winter I was good to go. I used a brace for most of the season even though the doc said I only needed it to one year after the surgery date. It never bothered me until I partially tore the MCL of the same knee in ‘03
Post op Rehab is the key. If she sticks to her rehab schedule she should be OK to resume her regular life.
I think foregoing surgery is just setting yourself up for more problems down the line.