Percy.
i get that but i think things are better when you have everyone putting their heads together. some of them have probably worked out stuff like this for the dmle or probably know more than we do.
but as for me. i'd go with a last minute meeting place with an escape plan and backup. if she shows up and doesn't bring company, stun her right away. take her wand. check her for tracking charms, portkeys, a backup wand. whatever she could possibly use to get out. bring her back to wherever you're going to keep her before she wakes up so she has no idea where she is. and then i guess wait and hope this ends.