According to realtor.com, the home “was last sold for $1,550,000 in 2006”, so it certainly looks like the mortgage has been extended. That’s if it’s true that the current outstanding mortgage is $1.5m (I can’t remember the source for that but as I recall it was from Alice’s side).Wouldn’t it be more common to have a 30 year mortgage, in which case they would not be close to paid off…
On the other hand, if you’ve owned a house in that neighborhood for 15 years, it’s probably appreciated in value, which accrues to you, not the bank.
p.s. I won’t repeat the home address here but it’s easily found because Alice has put up photos on her Instagram showing it, e.g. on labels and flower deliveries.