。
She has long arms and long legs.
Literal
She [topic-は] hands [also-も] feet [also-も] long.
~も~も (both X and Y) pairs 手 (hands/arms) and 足 (feet/legs) as both sharing the quality of being long. In Japanese, 手 covers both 'hand' and 'arm,' while 足 covers both 'foot' and 'leg.' The sentence describes a physical trait — long limbs — using the inclusive も to emphasize that both upper and lower limbs share this characteristic.