As a member of the House of Lords she can claim an Attendance Allowance for each day she actually "signs in" to the House. Additionally she can claim an allowance for "Day Subsistence" to cover cost of meals and "Office Costs" totalling £255 PER DAY. As a Minister she may make a claim of £5,000 pa to help defray Secretarial Costs (over and above the secretarial support given by the Departmental Civil Servants) and she may claim 40pence per mile travel costs to cover up to 10000 miles pa home to office travel.
Then there is the £38,280pa she has claimed for maintaining a home in London.
Add that little lot to the Ministerial Salary of £113,000pa that she is paid (Oh and that is the only bit of income that she is taxed on)
I doubt that she is really worried about a fine of £5,000 particularly as it has been levied as a civil matter and not a criminal one.
She also gets to keep the Lords allowances even when we boot Labour out at a General Election and has a Ministerial Pension to look forward to.