In barely zone 4 Montana at the Greenhouse Nursery, we used to overwinter a couple varieties of Raspberries outside in pots. We'd cut them down to the nubs during the October winter preparations and put them in the beds rather tight packed, then cover the beds with white nursery cloth. (Some brand of Remay).
But she's in San Francisco, with that SPLENDID climate, especially if on the Pacific side, with only the rare barely if ever frost.
Depending on the kind of Raspberry, cut it to the nubs or only cut off the oldest canes. Let it be in a good sized, 5 gallon bare minimum, pot with plenty of drainage, and good compost for soil.
Some bramble berries might just go semi dormant there. Even here 180 miles north of San Francisco, my thornless Burbank Blackberry held some leaves all winter. Raspberries go dormant a bit easier.
Around dormancy break, right before if possible, uppot them to bigger pots and primo the soil with bone meal or a good organic fertilizer blend. Whitney makes some good mixes. They'll like a sip of well diluted fish emulsion or one of the good cold pressed seaweed liquids well diluted, also available in and near the bay area, once every few weeks in spring, and again in august and september.
That'll make them grow like weeds!
and next year she might want to uppot them again and snip some of the ground shoots off and put them into their own pots.
Next year after that, she will be ready to open a raspberry plant nursery, or a farmer's market...
