H,
As a survivor who has had all treatment done here in Canada, I can tell you that I think at this time you have little to be concerned about when it comes to care quality. We do have some of the best teams around.
If and when you start or more important your mom starts feeling uncomfortable with her team, then it will be time to look for other options. Make sure you ask questions, make sure those questions are answered in a manner that is clear to all involved as the support team. If the "Red Flags" start going up it's time to seek other new advice.
David