It all depends on your plans for the day, your daughter's health and stamina, and your personal feelings about strollers (whether you see it as a helpful tool, or an annoying bit of extra baggage). You're on the right track though, OP, with planning attractions that will allow for periodic resting!
We're probably in the minority, but our kids have never used or needed at stroller at WDW, even visiting as early as age 4. However, we have several factors in play that others might not, and which might make all the difference as to whether a stroller is needed:
(1) The kids can handle walking. My kids are tall for their ages, energetic and in good physical shape -- at the time of their first WDW visit at ages 4 and 6, my daughter and son were 45" and 50" tall respectively -- too big for most strollers -- and had proven on visits to local festivals and hiking trails that they were able to walk several miles.
(2) We don't play all day. We divide our day into 3 parts with a nap in the middle: a 4-hour morning tour from rope drop to lunch; a 3-4 hour break in which everybody takes a bona fide nap and maybe a swim; and a 4-hour, more relaxed evening tour that includes a TS dinner, so the kids are never on their feet for more than a few hours at a time without a substantial rest.
(3) We do our best to save steps. We use rope drop arrivals, thoughtful touring plans, FP+ and internal park transportation (e.g., WDW RR) to enable us to tour attractions in a fairly straightforward route and minimize unnecessary criss-crossing of the parks and long waits standing up in lines.
(4) We stop when we need to. We visit during lower-crowd seasons and build extra time into our touring plans so we can be flexible and take restroom/snack/ice water breaks as needed without sacrificing our touring efficiency.
(5) We can't stand the heat, so we stay out of the kitchen. We visit during times of year when temperatures are not extremely hot (e.g., October, November, April or May) -- for us, high temperatures combined with high humidity sap our strength like nothing else.
(6) We are able to pack light. I bring a small crossbody park bag with all of our essentials, we don't need any special snacks or medical equipment with us, and we wait until our last day to buy souvenirs, so we don't need to rely on a stroller to haul around any additional supplies, purchases or foodstuffs.
(7) We aim for a full night's sleep. Until our final night, when we stay up late for "Wishes!", we do our best to preserve the kids' normal bedtimes and wake-up times, so they're on their usual schedule and able to get a full night's sleep every night.
(8) We take care of our feet. The kids wear good-quality, broken-in sneakers with moisture-wicking socks for our hectic morning touring, and generally change to waterproof hiking sandals (e.g., Tevas) for the evening. Wearing the right shoes minimizes foot fatigue, and changing footwear mid-day also helps to prevent blisters.
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