OP I've read your other thread.
There is no doubt that your DD has been subjected to discrimination on 3 counts.
Please bear in mind however that the employer in this situation won't do anything until they have to do something. They will sit back and wait, they will certainly never apologise.
The most effective thing you can do that won't cost you months of time, money and stress is to seek specific advice from an employment solicitor. This would be with the aim of them determining a suitable "sword of Damocles" type letter to send the employer summarising the situation described by your DD, of the specific aspects of law under the Equality Act (2010) that they have contravened and suggesting a suitable Ex gratia payment to allow the matter to be resolved.
They will either fold their arms and do nothing in the hope you'll go away, or they may get their solicitor talking with your solicitor and agreeing a settlement. If they force you to take it to Tribunal, because they take no action, you will be in for a long arduous journey, which may never fully recompense your DD for what has happened. Remember you have 3 months from the date of the last discriminatory event, for you to lodge with Tribunal, so the clock is already ticking.
Whilst it is good to call these diabolical employers to account, consider the effect of so doing on you, your DD and your family first and foremost.