There's a bit of a continuity error between this and the last page. We're gonna have that fixed by the next update.
Also, they are referring to what would've been Izzy's 17th birthday. Izzy hasn't celebrated her birthday in 9 years, so Abigail has very little memory of her ever celebrating it. If Izzy did decide to get back into that tradition it would mean a somewhat huge change in how Abigail sees Izzy.
We hope you all enjoy today's page!