Thanks for your question.
You should write a formal letter to her stating the details of the money owing, the invoices referring to the time you have already waited and that you require the money to be paid back (or a repayment plan suggested) within a reasonable time (eg 7-14 days). State that you are prepared to issue a claim at Court for the outstanding monies if necessary. Entitle the letter "Letter Before Intended Legal Proceedings" and send it by registered post. Keep proof of posting and a copy of the letter. Start a correspondence file for this
If this does not illicit a response you could ask a solicitor to draft a Letter Before Action to her. Although there is no need for you to get a solicitor to write a letter prior to you issuing a claim sometimes it convinces the debtor to take it seriously and pay up.
This will be cheap (£40-50.00)and may bring home your commitment to recovering the money.
If no response is received then you can issue a claim yourself through Her Majesty's Courts Service's online service http://www.moneyclaim.gov.uk/ . It's very straightforward to use and pretty cheap for layperson.
HMCS's website contains lots of useful information for issuing a claim yourself:-
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