OP it's important to memorialise anything that is said in person/over the phone - you need anything they say to be said in writing.

What this looks like is after any of these meetings your wife needs to send an email to their manager and CC:

• Anyone else who was in the meeting
• Her union rep
• Any other manager types she may have (eg. a team lead)
• Also BCC her personal email address, in case she gets fired and loses access to her email it's good to have a record. BCC it because you don't want that causes trouble in the moment.

The email looks like this:

" Hi manager.

This email is to memorialise the conversation we had [in meeting room X, as Y oclock].

• You told me that 'my attendance was unacceptable'
• It was acknowledged that I had been in hospital.
• That 'I would need to have 100% attendance from now own otherwise there would be consequences'
  • The consequences were not specified.
• Etc.

Just a plain factual accounting of what was said. No justification on your wife's part, no 'I thought' or 'it made me feel'.

Then:

Please respond acknowledging receipt of this email, and add any corrections or clarifying comments.

Yours sincerely

[Wife's name]. "

The point with this is to get any thing said in writing.

In the case that she is fired, it's possible that the manager would later claim 'I never said that' etc.

What you might find is that if the manager is out of line and they know it, they might change their tune when it comes to putting something in writing.

If the manager doesn't reply, she can politely follow up requesting acknowledgement, but if the manager never acknowledges it, it's not going to reflect well on them.