Interesting. I bet she went even lower than 304 last night-- this looks like Karen's predicted bounce, as I don't think she's ever gone higher at a +2 before.
I don't know if we've talked about this yet, but a bounce is when a kitty's body responds to low BG numbers it isn't used to by working to get the numbers back up. It's an annoyance when you're trying to figure out doses, but it could be a good sign that at least she's hitting those low numbers! Lots of cats go lower in the nighttime cycle-- this is one reason we always say to try to grab at least one mid-cycle number. Even if it's just a +2 or +3 (+4 would be better) before-bed number, it will help figure out if Phoebe is one of those lower-at-night cats, and plan accordingly.
By the way, we've been talking about getting some ketone sticks and doing some testing-- any success yet?