Thank you for your update, and the share of positive news re: certificate.Good news from me - my certificate arrived today. My oath was on Jan 19th so I am very happy it arrived so quickly, especially after the clerk said it was not possible for me to have it expedited. I just booked my flight so I have proof for the passport office. I do not have any medical proof of my mothers situation so I am hoping the flight is enough.
I filled in the form online about requesting a callback to make an in person appointment.
Hoping it goes smoothly, booking my flights made me super anxious.
I've not doubt passport will be just fine for you! Safe travels!