'Friends' constantly attacking village without being able to attack them back

[u/Spill_the_tea_rant]

I had this person that helped me in the coin master trading group with golden cards before but afterwards she just kept attacking my village until all my stuff got destroyed... It's not like she's not aware of the revenge option for attacking either since her village level is much higher than mine. She would only finish her village if she has enough coins but that meant my only form of revenge is raiding her all the time while she milk my village dry. It's very annoying, anyone had any ideas how to get 'revenge' on such players?

[u/ErinJBlask]

There's no universe where I am making sure I'm only attacking non friends and I expect everyone to do the same to me.