Yes, Germany, as do we, have certain restrictions on speech. However, her speech was a call for further restrictions on speech, speech that she doesn't like. That is a slippery slope.
For instance, what if 40 years ago it was decided that calling for Gay Rights was immoral and you were not allowed to talk about it.
All speech, whether you like it or not, must be protected. It is the only way that people can decide which ideas are good and which ideas are bad.