This answer is from Vibes...
The only way she could secure a loan against the property and erode the equity would be to forge your details, this can be done although not easily.
You can do a search on what details HM land reg have on your property by heading to their website, entering the details and paying a nominal fee, this report will tell you if there have been any other loans secured against your property.
£200 an hour sound better than losing all that equity.
Apply for legal aid.