Possible move from IR-ESA to UC after inheriting?

So my daughter has been 'lucky' in that she has inherited a biggish lump sum from a long-lost auntie. The stuff of dreams, eh

Of course, this sudden increase in capital has meant that her income-related ESA has been stopped, although the claim is still active and she will still receive her National Insurance stamp.

I was told today by one of the DWP operators that in the unlikely event of her reducing the capital to below the threshold within 12 weeks (it's more likely to take a couple of years), her claim would be reconsidered - so far, so good.

But, if it was after that time, he said that as things stand at the moment she would be 'signposted' to apply for Universal Credit instead. Again, fair enough.

Now, to my question: if she were 'signposted' to Universal Credit in say two years' time, would her spending of that inheritance have to be accounted for? So, another way of looking at it is this: Is UC means-tested, and do we still have to be careful how we spend the money in case the DWP could see her spending as deprivation of capital? Obviously we are being completely transparent with the DWP, but if there is now no restriction on what she spends it on, then the freedom would be good to know about. I hope this makes sense!