A date doesn't have to cost much or take all day. What she'll remember is that you planned it just for her and your phone stayed in your pocket. Here are ideas sorted by what you've got.
A fort kit Poles and clips so the blanket fort stays up through the whole movie. Find one
A headlamp her size For the backyard campout and finding stars on the list. Find one
A kids' cookbook So she can plan the pancake breakfast menu herself. Find one
A paint-your-own pottery kit The pottery studio date, at the kitchen table. Find one
A good thermos For hot chocolate at the sunset. Find one
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What works at each age
Under 6
Keep it short, around an hour, and close to home. The part she'll love most is having you all to herself.
6 to 10
Let her plan part of it. Give her a budget and a few options, and let her run the day.
Tweens and teens
Fewer questions and more side by side. Car rides, cooking, a show you only watch together. Let her bring the idea and you bring the time.
The hard part usually isn't the idea. It's getting it on the calendar before the week fills up. Tap Plan it on any idea and it goes on your calendar and into Halftime on your phone, with a final whistle after. On the days that get away from you, call halftime: four taps, one play for the rest of the day. Free, no account.