If the ! hour limit didn't apply in 2018 then that brings the 10 minute grace period into play. Do you happen to know whether it existed as part of the code back then?
Off the top of my head yes, but unhelpfully IPC don't keep previous versions of their CoP on the website - you might be able to find an archived copy with some Googling.
If they pass it back to Excel for court action, are they right in saying that her total charge may rise to £235? Is the extra the court fee for filing the claim?
Roughly - in general a loss in court costs around £200-220, comprised of the £100 parking charge, around £70 in debt collector costs*, around £50 in legal representative costs, £35 court fee, and interest**.
* These debt collector fees can generally be challenged successfully, even if you lose the overall claim (there's some discussion on this
HERE - those posts focus on ones where the entire claim was dismissed as a result, to be clear it is very rare for that to happen, but fairly common for the £70 to not be awarded even if the defendant loses the overall claim).
** I'd be minded to challenge at least some of the interest here - there's seemingly no good reason why they have taken 5 years to raise a claim.
One further thing to clarify - is there a reason you know of as to why no previous correspondence was received? Has your daughter moved address between the date of the parking and now - and was her vehicle's V5C document up-to-date with the right address on the date of the parking?