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This is certainly a potentially serious condition and deserves early evaluation from your pediatrician.
Limping in a toddler can be due to many reasons including limb length discrepancy, DDH, occult fractures, and rarely aseptic necrosis of the femur head. Sometimes viral infections may lead to synovitis / inflammation around the local joints. Rarely an inflammatory / rheumatological / neurological cause may be found.
While the most likely cause may be some local trauma, given the potentially serious causes, the other possibilities deserve a serious consideration too,
Hence the need for an early pediatric appraisal
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Hello J C,
The original expert is off line.
The fact that she has no pain and has normal energy to bounce and jump, rules out most bone or joint related (infective, vascular) conditions.
But still this oddity should be checked, as constant weight-bearing on outside, involves lifting the arch of right foot higher, and this would sooner or later fatigue the small muscles involved for this.
Try keeping her feet clad with appropriate shoes all waking hours.