1/ Some comments on this case from the perspective of EU criminal law. (Obviously national law and the ECHR could also be relevant; and reportedly her lawyers are considering an ECtHR case if they exhaust national appeal procedures unsuccessfully)
2/ The EU fair trials law on access to a lawyer is relevant here, since her lawyers argue that she was denied such access during police questioning. Here's the key provision on this right, which builds on ECtHR case law. 
3/ There is a very limited possibility of waiver of the right, but press stories I have seen don't refer to this as an issue.
4/ A specific issue in this case is that in effect she became a criminal suspect while making a complaint to the police. The EU Directive explicitly confirms that it applies in such cases.
5/ More from the preamble on what should happen if a witness or complainant is suspected of an offence during questioning. It's impossible to tell from press reports whether these standards were complied with. (I recommend asking for a lawyer if you are ever in this position)
6/ There's also EU fair trials legislation on translation or interpretation for suspects who don't speak the language of proceedings. Again, though, there's nothing in press reports to suggest that was an issue here.
7/ Since she is a UK citizen, is Brexit relevant? Probably not. The proceedings took place in Cyprus, which applies all six EU fair trials Directives. That legislation equally applies to suspects who are not EU citizens.
8/ EU law might be relevant to a transfer of sentence to the UK. If the withdrawal agreement is ratified, that law applies to the UK during the transition period. The agreement also specifies what happens to pending proceedings at the end of this period.
9/ Note that a no deal on trade is irrelevant to this issue; the relevant part of the withdrawal agreement would still apply.
There's an EU law on mutual recognition of probation or parole decisions, but the UK opted out of that law in 2014.
There's an EU law on mutual recognition of probation or parole decisions, but the UK opted out of that law in 2014.
10/ EU law should be applied by national courts, but if any national court has a doubt about how to interpret EU law, it can send questions to the CJEU. Criminal cases are sometimes fast tracked in the CJEU if the person concerned is detained, but she hopes to avoid that.
