Being asked to cut work days - is this redundancy?

Are there any employment lawyers/HR people on here? I have a friend who currently works 5 days a week for an employer she has worked for for nearly 10 years. It is a very small company where everyone has distinct roles - she is a skilled craftsperson. Her employer is going through hard times and asking staff to go part time, she is being asked to go from 5 days a week to 2 days a week as there has been much less call for what she does.

Is this redundancy? Can you be made "partly redundant" (ie the 3 days she is now being told she does not work)? What are her rights? It is not a case that someone else will do her job in the 3 days she is not employed it is just that there is not enough work for her to employed full time. There is no chance of her being offered a different job for these 3 days as (1) she only wants to do her skilled craftsperson role and (2) all other roles are already filled.

I should add that the employer is tryng to help her find additional similar employment with other unrelated companies that he knows in their business world that might need her skills so he is not being unhelpful I just wanted to know what rights she has. Thank you.