I'm sorry, this is a bit of a ramble because the video is a mess. Helen's argument is that a mental health day is different to a day off. Dani also mentions taking a mental health day as a sick day (unless she means unpaid leave/ very last minute annual leave?).
I agree that making time for yourself is important, but most of us just fit this into our weekends or a couple of hours on an evening as and when we can. A mental health day IS a day off. These people seem to think that a 'day off' equals doing loads of things and making loads of plans, but it's different for everyone. It feels like it's a revelation to Helen and Dani that they can have a day off and not see other people!?
There's also a difference between making time for yourself and being unable to work and ringing in sick. Gallivanting around the local garden centres, mumbling round the garden with your arse out is not the same as feeling stressed/ anxious and not mentally well enough to work. One is a day off, one is a sick day. It feels odd to label them both as 'mental health days' for the purpose of this video because they aren't the same thing.
(Also, L&Y dungarees aren't meant to look like that, what size are they!? The bib part is almost at her chin, on mine it's probably mid-boob.)