Consider it like a girlfriend who is in the hospital. You might withhold what’s going on when you visit her or talk on the phone, because she’s clearly got a lot on her plate right now, but what do you do when she ASKS you directly? Whatever comes naturally, right? It’s not going to be a complicated thought out series of decisions about what you think she can handle, and the best way to present that info... instead you’re going to rely on your own instincts and observation. Tell her however much feels right... and if that appears to have been an overestimate? Back off a bit / change the topic / etc. All based on your intimate knowledge of her, youourself, & your relationship.