This exercise seems strange today. "She seemed strange today." (past tense) is allowed, but "She seems strange today." (present tense) is prohibited. Both should be permitted.
I was wondering this too. If this is about emotions I would translate this as "she looks a bit off today" as "she looks strange today" is more about her appearance, e.g. She is usually a preppy but is wearing a hot pink leopard print dress today