This plant appears to be in a pot. Problems with wilting fuchsia plants may be due to lack of moisture, but that is not the only cause.
Was this pot subjected to the high winds and 90 degree plus weather we had this past week? During time of high heat and winds, potted fuchsia plants may need water twice daily, especially if the plants are exposed to sun and wind. ... However, never water if the soil feels moist, even if the leaves look wilted. Over-watering can cause wilting also.
If the pot was properly watered, the problem is likely too much heat and heavy winds. Water only when soil in the pot is dry 1" down.
Fuscias also appreciate some shade at the hottest part of the day during very hot summer days. To flower profusely, they need a fertile, moist but well-drained soil. Hang fuchsia baskets in areas of the garden that offers partial to full shade; fuchsias perform poorly in high heat and sun exposure. Place them in areas such as porches.
You should also check you plants at least weekly for any insect or disease problems. Look for insects on the undersides of the leaves, identify them, and apply the appropriate insecticide.
If you have met these cultural requirements, my recommendation is to take a wait-and-see approach. Your fuscia may come out of the droopiness in time.