So sorry to hear about your wife's broken foot! Hope it heals well.
It's a good idea to have her get transportation and meet you, until she feels ready again to walk the long distances every day. There will be taxis in the towns for sure, although sometimes in the smaller villages the taxis will need to come from a larger town nearby. Uber is much less common in Portugal but does exist near some of the cities (
https://beportugal.com/uber-in-portugal/). Note that Uber is virtually non-existent in Galicia, so once you hit Spain on the Camino Portugués you'll need to just get taxis.
You could also try bla bla car:
https://www.blablacar.co.uk/ but that depends on driver availability.
And of course buses are available, but I don't know much about schedules and such - best to check with hotel proprietors or tourist offices as you go to get that information.
Another course of action could be that your wife stays in one town for a couple of days/ a few days (if it's a town that has more amenities) while you walk during that time. Then she can take a bus or a train to meet you. It would be like a personal retreat for her!
Hope it all works out and is a great trip for both of you, even with these unforeseen circumstances! Buen Camino.