My son had trouble (last year when he was that age in first grade) with one particular pair of pants that was difficult, and I finally bought a pair of those elasticized, cork screw shoe laces so that he wouldn't have to lace them because it was a wretched battle every day to get his lace-up shoes on, which solved the daily shoe battle. He can tie shoes, but is still awkward at it. This year my MIL bought him a pair of velcro shoes, so it's not an issue any more. Although, I believe his church shoes are lace up, and he hasn't been needing help with them, so maybe he can manage once a week.
So, yes, I think it's normal. Pull on pants are easier to deal with, and more common with girls. Just make a point of buying easier clothing in the future. Have her try them on and do them up herself, and if she can't, get something else. If her socks are difficult to get on, perhaps they are getting too small? I noticed that with my second son, so I solved that by getting him new, bigger socks, and we're all happy.