Like the others, I struggled with this at first, but then I realised that me time isn't a luxury to feel guilty about - it's a necessity. You need some space that is you, that isn't work that isn't being a mum. It's about maintaining your heart, your soul, your person in order to give your best to everyone else.
Shell might not need that right now, (maybe because she doesn't know what direction to take yet, I know I've struggled with that) but there will come a time when she also recognises the need.