init python:
    del_exit = False

transform change_transform(old, new):
    contains:
        old
        yalign 1.0
        xalign 1.0
        linear 0.1 xalign (1.3 if del_exit else 1.0)
    contains:
        new
        yalign 1.0
        xalign 1.1
        linear 0.1 xalign 1.0

And then in the script:

label start:
    del "blablabla"
    $ del_exit = False  # Ensure she stays
    other "Del remains visible."

    $ del_exit = True
    other "Del will now leave."
    $ del_exit = False  # Reset for future lines