Hi Desantos,
I live in Vancouver BC, we had a very mild 'warm' winter this year.
My mother came to visit from Kelowna for Christmas and stayed until Jan 19th.
She said her drive home was perfect and no snow.
So check the road conditions, maybe you will be fine with a rental car. If an elderly women did it, so can you.
The greyhound bus discontinued their service at the end of 2018. So no longer any public transportation services that go across BC.
Another idea is a website
www.poparide.com
You can download the app on your smartphone or use the website to book rides with random people that are offering rides to your destination. I have used this website myself to get to the Okanagan (kelowna) a few times. I have also hosted rides my self. Its a very great service, you should check it out.
If you have anymore questions, feel free to ask.