AIBU to be surprised someone on £34,000 receives Universal Credit?

[Balicious]

I was listening to BBC Radio 5 Live at work yesterday morning. They were discussing the Conservatives’ proposal to stop people spending benefits on alcohol, cigarettes, etc.—but that isn’t what my question is about.
One caller said she earns £34,000 a year as a trainee social worker and receives an additional £500 a month in Universal Credit. She didn’t mention having children, paying rent or having a disability—she simply said she struggles to live on £34,000 and needs Universal Credit to top up her wages.
What is going on? That’s more than I earn! Could I apply for a top-up too? Has anyone else heard of someone working full-time and earning well above minimum wage having their salary topped up by Universal Credit? I just couldn't get over what I was hearing!

@Seajaye

UC mainly helps people in work

The majority of UC claimants aren't in work.

you have not quoted the whole of sentence in full.

However I accept your general point, 44% of claimants are in paid work which means 56% are not.

OP seemed incredulous that a gross household income of 34k was deemed low enough to qualify.