Translation:She is the woman whom we all have respect for.
"She is the woman for whom we all have respect", was marked incorrect when obviously it's fine, and, if anything, better English than DL's more colloquial translation.
Nordic languages put prepositions at the end of sentences much more readily than we do in English, in which language it's often a hot debate as to whether it's acceptable to do it at all - personally I'm a rather liberal descriptivist and would say it's fine (although I personally tend to avoid the practice in my own speech and writing), but plenty would argue against it.
Have reported so hopefully it'll be added as an alternate answer soon.
Yes, I noticed that after I commented. I wrote "she is the woman we all have respect for". (Not ideal English, but a verbatim translation). Duolingo marked it as wrong, and showed in the marking box the correct answer, which was " she is the woman we all have got respect for". But yes on the discussion page the model answer is different. Bit confusing all round really!