I understand freedom of speech and I understand she's free to speak but there may be consequences. I understand that there are huge complexities in the legal system. I understand you can enter into agreements (part of your speech) that effectively gives away your speech. But if you step back and look at this situation, it's just fucked up that a corporation can do this to you. If freedom of speech is supposed to be inalienable, these types of agreements should not be legal.

disclaimer: She lives in the UK and I'm speaking from a US perspective.

Is it freedom if you can't make an informed choice to sell it?

In Germany, this sort of thinking is the reason you can't release anything into the public domain. People are presumed to be too stupid to be trusted with the decision to renounce their copyright and so they are "protected" from this possibility.

In a normal society courts should be protecting from signing away basic freedoms

Which means it’s not a right