Carers allowance and rental income

Hi,
My sister recently claimed DLA for her 11 year old daughter and has been awarded higher rate care and mobility. She had to give up her job because of the increasing care needs of her daughter and is looking into claiming carers allowance but there is a question on the form asking if she has any income from renting out a property. She is part owner of a house that is rented out for £700 per month but obviously does not have that £700 to spend on herself - a big chunk is taken in taxes, then there is insurance, maintenance etc to pay for out of the remainder. The bank account for the rent is in her name. So far in about 30 months of renting it out she has never withdrawn any money except for the expenses relating to the property and she worked out that so far the average total profit is only about £100 per month - she had to get the living room floor replaced due to woodworm and a new boiler, as well as other smaller maintenance expenses, plus insurance, tax etc.
The tenancy agreement has herself and her husband as landlords, but our dad is also part owner of the house.
The carers allowance form only has a space for the income from the rental with no opportunity to explain outgoings etc.
How should she approach this question - should she work out the profit or put the full rental amount on the form? And as the whole profit is not only for her, should she put half of the amount (as her husband is also on the rental agreement).
Her husband is in full time employment, would his income be taken into account for her carers allowance application?

Hi, I know tax is not the same, but our accountant splits the rent from our old house down the middle for tax purposes and sets all expenses such as you describe [it needed a new boiler just like yours] and even regular paid-for gardening against tax. So from my I must emphasize, unqualified, point of view I would use the one box to enter the net amount that accrues to her and not the husband's share if that is not what the form asks.
Try scouring 'gov.uk' for the answer as to whether his income is taken into account.
Best wishes, Denby