tl;dr - none of the rumors about her imprisonment were overblown. she and the other activists were literally tortured: abused, beaten, dehumanized, starved of food and water, made to sleep in bug-infested cells, forced to sleep in the cold and stand all day in the heat outdoors while severely dehydrated. Some of her words:

They moved me very brutally to a corner that I was turned towards. ‘A special place for a special lady’, they said. And then they had learned ‘Lilla hora’ (Little whore) and ‘Hora Greta’ (Whore Greta) in Swedish, which they repeated all the time.

It was mockery, rough handling, and everything was filmed. Everything they do is extremely violent. People’s medications were thrown into the trash can in front of their eyes. Heart medication, cancer medication, insulin.

What we have been through is only a small, small part of what Palestinians have experienced. On the walls of our prison cells, we saw bullet holes with bloodstains and messages carved into the walls by Palestinian prisoners who had been there before us.

The flag was placed so that it would touch me. When it fluttered and touched me, they shouted ‘Don’t touch the flag’ and kicked me in the side. After a while, my hands were tied with cable ties, very tightly. A bunch of guards lined up to take selfies with me while I was sitting like that.