Since its kind of hard to determine exactly what is going on without a few more details, such as your location (so I know what is going on weather-wise) and whether the plant is indoors or out, here are a couple of reasons Gerbera daisies flowers wilt while the plants look fine:

1) Plants purchased in indoor stores (such as in supermarkets and indoor garden centers) tend to take a while to acclimatize to garden conditions (when grown outside). This is especially true in warm parts of the country or if there is a heat-wave or drought going on. The flowers may wilt even if the plant appears OK. While this can sometimes be corrected with a little more watering, I prefer not to, as overwatered gerberas can be a problem.

2) In warmer parts of the country, or in times of excessive heat, Gerbera flowers may wilt while the plant looks fine. Here in central Florida we have had temperatures close to 100°F in addition to no-rain (in the east coast) for about two weeks. While the plants in the picture above are fine because I water every three days or so, the flowers on one of them usually wilt around the time the sun shines directly on them. This problem usually goes away with cooler weather or regular rain. Other Gerbera daisies I own have always had the drooped down flowers in warmer times of the year. Honestly, you may just want to wait if the plant appears healthy and see how it reacts to lower temperatures or even nighttime conditions.

Of course, check the crown of the plant for any signs of trouble or insects. Some plants also come stunted from the nursery. If a nursery neglects a plant too much (common in national retailers), the plant may have been in such distress that its growth stunted. Often stunted plants will look fine, but they may refuse to grow and may even wilt just after watering. I have some blanket flowers in my garden which suffered that fate.

Well… I hope this helps some. Use the contact Gardenipedia link above if you need additional help with your daises.

A lot of times with gerbera daisies (when there is no visible sign of insects or disease), flower defects are due to genetic circumstances. Some gerbera daisy varieties are heavily hybridized and have serious problems: double stems, twirling petals, backwards petals, etc. There really isn’t much that can be done about this as it is in the DNA of the plant. Future flowers may come out OK.

Unless you see webbing or bite marks on the flowers, it is probably a genetic issue due to the fact that a lot of plants out there are hybrids of hybrids, causing a certain instability in how each plant comes out.

–Fernando
Gardenipedia

I have just brought to my office a Gerbera from a nursery last week. I got two – a yellow and a red one. The yellow one is already dying, while the red one remains healthy. I have been watering both of them regularly – once a day. On Friday, I watered the pots until the water came out at the bottom of the pot, since I was gone for the weekend. On Monday morning the yellow plant had wilted, the flowers and leafs alike. It looks like there are these tiny gray dots on it or something. The leafs have turned yellow and the buds have wilted as well. What should I do ??