We locked the keys in the trunk of her 2002 Lincoln

Question edited for clarity.
Question moved from Television and Video category.

Normally you remove the back seat back, and pull the emergency release. Or a mobile locksmith can get in. If the lock is worn, any similar shape key may work with some jiggling. Also look in the glove box for a release button.

I just found this in your Owner Manual for Cutlass Supreme

Remote Trunk Release (OPTION) Press the yellow trunk release button located under the instrument panel on the driver's side. Your automatic transaxle must be in P (Park). Remember that your trunk can be opened at any time using the lock release. Be sure to lock your doors

and also access into the back.

Trunk Access Panel If you have split rear seats, you may have a trunk access panel for storing long objects like skis. Pull your rear armrest down using the strap. Then pull the latch on the trunk access panel towards you to open the panel. To close the access panel lift the latch.

https://carmanuals2.com/get/oldsmobile-cutlass-supreme-1993-owner-s-manual-79185

Videos regarding a locked trunk.

https://www.google.com/search?q=open+the+trunk+on+93+oldsmobile+cutlass+ciera+without+key

..

remove rear seat or push trunk release button

As in your button is failing? open back seats and pull emergency internal release, or use key

If it has the electric trunk release, the button could be in the glove box.
Otherwise you may have to remove the back seat to gain entry to the trunk.

check trunk fuse

You can try to remove the trunk switch and cross the two wires on the back of the switch if the switch is bad. If that does not work put 12volts to one wire and ground the other to the metal of the car. If the latch release is good it should pop open. If the solenoid on the latch is bad your going to need a lock smith.

if theres no trunk release check the top of the rear seats for a button or tap to push or pull and the seats should fold down most cars that year had them but not 100% sure if yours does hope this helps

please rate and report back on results.

Make sure you did not inadvertently engage the lock out.

Trunk Release Lockout Switch
The trunk release lockout switch is:

• located within the glove compartment.

• disables the trunk release switch.

Does it work with your key fob?

do the back seats recline?

Using your keyless entry on the keypad, press the 5 digit code to get into the door and press the 6 key immediately after. Lincoln has several codes in addition to the 5 digit keyless entry like pressing the 3 to open all the doors, the 6 for the trunk and pressing the last 2 buttons at the same time to lock the doors.