Boring solicitor perspective here.
The issue currently being dealt with at court will be the "costs assessment process" where the winner's costs are assessed by the court at an amount deemed "reasonable" by the judge. The parties should ideally try and reach agreement without involving the court but evidently that hasn't happened here.
I read in the Guardian yesterday that CR's costs were a third over what has been presented in her team's costs budget. The budget is a detailed estimate of all costs up to and including trial - both parties each have to provide one some months before the trial. The court will have reviewed, possibly amended and then approved/fixed the budgets. This means that the winner will usually be limited to the maximum in the budget even if successful although the judge has discretion to consider any exceptional circumstances.
The costs judge can also allow an enhanced element of costs if the winner has previously made a good offer to settle which the loser should have accepted rather than going to trial.
Whether or not the winner's budget has been exceeded, the losing party can challenge any "unreasonable" elements of costs. for example, lawyer rates too high for certain basic tasks, excessive time spent, unnecessary work that did not progress the matter. It's entirely normal for the winner to get 20-30% lopped off. More can be docked if the judge thinks the winner/winners lawyers have not shown "good conduct" .
CR's team will be expecting some sort of reductions especially as the budget was exceeded. They will have (should have) advised CR on costs throughout and I assume she was happy to spend some money she was unlikely to fully recover in order to have a good team and a thorough approach.
The fact that this has gone to assessment is very interesting as the two legal teams will have made each other offers to settle CR's costs. RV's team has evidently not offered an acceptable amount. CR's team is more likely to have offered a reasonable amount but RV hasn't accepted, perhaps because she can't afford to pay.
It's all a total mess for RV as she's now incurring more costs of the assessment process. My bet is that her team will be desperately arguing "poor conduct" to try and batter down the costs as much as possible.