Can't understand where all the money's come from.

Hi there hoping someone can help. My daughter has just been awarded standard care pip. Her bank account shows her payment and back payments from when she originally claimed. She also is awarded income based ESA support group and her bank account also shows DWP £900 and odd pound along with the Pip £800 and odd pounds. She also claims child tax credits and bank account shows that amount too. My question is neither ESA or child tax credits are due until next Tuesday and usually paid fort nightly. Have they changed the dates and now pay monthly? She don't use the phone so I do it for her, don't want to phone DWP if they have changed dates and the frequency they are now paying.. Any help appreciated please. Hope I've explained so people understand what I'm saying

Thankyou Gordon for your ever helpful advice, it's much appreciated. I havnt phoned DWP for my daughter as yet. But to be honest I can't see it being back payments of either ESA or tax credits. She has received child tax credits since it came into force and her son is 16 now. As for ESA she has been receiving it since 2013, in other words they are not new awards, unless ofcourse they have been paying her short..I will give them a ring on Monday. Thanks again.

Update Gordon, thanks again for your advice.. I've now seen the daughters award letters. Yes you was right it was back payments for ESA as well as Pip from April 1st 2019. Apparently now she's been awarded Pip she qualifies for the severe disabled premium of ESA as well as being on income based support group...so they paid her back payments to the 1st of April when she qualified for Pip. Thanks again, that's clears that up then...