Regular/irregular income from my mum while on LCWRA

Hi all,
First time poster!

I am on universal credit limited capability for work related activity, and my landlord has increased my rent beyond what I get in universal credit. my mum has offered to top up the missing rent, let me use her card for food shopping and give me some money to cover essential bills for gas, electric, asda (food, cat food, bathroom and cleaning products), tv licence, and a £10 monthly topup on my phone.

I am wondering what is the best way to do it that won't put my universal credit into jeopardy as it would be a disaster if the lcwra I had to go to tribunal to be given was at risk. 

Does it matter who's card pays at asda for the shopping? The same goes for the gas and electric bill payments if they come out of her account by direct debit.

Crucially though, what do I do about the £280 she will be putting into my bank account to meet the higher rent each month? Will it be classed as regular income I have to tell them that will reduce the universal credit payment?

I suggested that she just put all of the money on prepay debit cards I can use so it just looks like she is spending her own money on my expenses without going through my bank account, is that illegal? 

I'm trying just to survive, my life hasn't changed and I've done nothing wrong. My family want to help but the social security system seems rigged to make me worse off when kind family are wanting to help.

Thank you