It will be very difficult but you will get through it because of your DD. It will be a few minutes at a time, then a few more, then an hour and so on. I wasn’t prepared for the deep fog my brain fell into and lasted several months.
Try and plan if you can, get a notebook and write down everything you can think of that you will need to know, accounts, insurances, passwords to laptops and phones. DH and I had done this over a few year before his actual fairly quick passing and it was a saviour at a time my head was bursting with loss.
change as much as you can into joint names if not already, cash in premium bonds. (Deed of trust, ie prenup, if you had one, arrange to removed).
Make sure you’re 100% beneficiary of private pensions, anything invested over 50,000 will be inaccessible if in his name alone until Probate granted, mine took 12 weeks from submitting but took six months to draw together the paperwork (DH had businesses which needed valuing and took for ever to get).
You will be eligible for a bereavement support from the government, a lump sum, then an amount per month, tell them you have a child, must be claimed within three months of loved one passing. Just googled it, £3,500 lump sum and 18 months of £350, assuming you live UK.
As other have said built memories for your DD, and return and ask again and again when you are stuck, before I lost DH mnsnet was a giggle and a scroll, since losing him it’s been an invaluable source of help and reassurance when I didn’t know what to do (named changed pretty much for every thread, especially the financial questions).
Really sorry that you are going through this OP, sending virtual hugs as this incredibly tough time.