Hi
As far as I know it can be as many times as the Peson wishes it to be after all it's belongs to them and if they would like to change their plan who can stopped them. Thats what Person Center Plans are all about the wishes and aspirations of the owner of the plan.
EG. If his or hers Medication changed it would have to change on the plan straight away you couldnt leave that till six months time when some one wanted to update plan.
Hope this helps
Yes, a care plan must be revised every time a change appears in medications, or mobility problems, or swallowing difficulties emerge, or .... no matter what problem emerges. Every time a problem appears, then the care plan must be amended/changed so as to record and to indicate the 'care interventions' that are required to deal with those problems.
So, if problems emerge daily, then the care plan needs to be changed, daily.
If a problem emerges over a week, then the care plan must reflect those changes, immediately.
Each and every time a new potential 'area of concern' appears, then that's when the care plan needs to be looked at, reviewed, and changed. Because the care plan is the document that the 'care staff' need to refer to (many of whom may be agency workers, who arrive one day and are gone the next).
If there are no 'newly emerging' problems, in anyone living in a residential care home (with or without nursing), then count yourselves fortunate.
You should have been allowed to be involved in the creation of the care plan, so that you can make sure that they are all aware of your knowledge of your Mum.
And make sure that you ask for a copy of the care plan, that you can take home with you and read when you are able to read it all, quietly and comfortably.
Take care meanwhile of yourselves,