Is it your goal to lose 17.5kgs? It certainly is doable... I found myself recently stressing over losing an extra 4 kilos to get to my late 20s pre-pregnancy weight. I have since re-examined that and decided to just go with the flow. I'm honestly happy where I am now so I don't need to work any harder.
I forgot to say earlier that I hope your friend remains healthy and well, despite being exposed. Prayers to them in their quarantine.