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if you choose Lot's Wife to enter battle again her special ability has already activated and cannot activate again.
Garrison would stay in battle. From the REG:Immunity protects a character from being harmed, affected, or removed from battle
It would seem to me if you return Lot's Wife to territory then you would have to replace her with a legal target which would be herself or another EC.
The same way you cannot target Garrison to remove him from battle, you also cannot target him as the chosen blocker so you must choose another character to add to the battle.
...replace her with a legal target which would be herself...
I'll repeat my question: Why is Lot's Wife able to enter battle a second time?
Characters leaving battle may not return to the battle that turn with the exception that the choosing player may select one character just removed and put it back in battle..
Thanks for then info Prof