Why didn't you put her in the passenger seat instead of the boot then 😁
Happened me twice,
Easy fix with the correct Torx bit a TX40 is required along with a flat head screwdriver to get things sorted.
the torx but is available from Halfords for a few pounds on its own not as part of a set as saw in image below
You need to get in to the boot from the back seat,
Temporarily remove two plastic caps from the lower boot door panel,
Then stick the Torx TX40 in to both holes to unbolt the lower boot latch bracket from the chassis.
Followed by popping out the four plastic retaining plugs which hold the lower boot panel in place
then lift the boot door to freedom 🙌 followed by putting it all back together.
I can add more detailed images if desired