Australian and New Zealand Gardening: Can anyone help I’d the black marks on my Hoya PLEASE, 1 by RinaA

RinaA wrote:
Got home yesterday and did my usual rounds of my plants to discover one of my Hoyas (Australis) a little odd.
She has black spots/marks on a few of her leaves.
Much appreciated if someone can help identify what is wrong and how I can treat her. I haven’t had her long on inspection of her soil I found a couple of wee mushrooms and the soil feels compacted.
Thanks in advance (worried plant Mumma here)

I have isolated her from my other plants

This message was edited Jan 28, 2021 12:50 PM