Is it still grassing up if she's asked for her opinion on something that happened?
Surely grassing up would require her spilling the beans on the dinner he attended, as opposed to answering a question on her opinion of Ellwood's actions by a journalist.
To further the discussion re. nasty Tory female ministers, unashamed bully PP is back on the case about grassing-up ones mates:
https://www.theguardian.com/world/2020/dec/17/priti-patel-dont-travel-to-see-people-this-christmas-covid