This tiny poem gives us just two lines, and they leave a lot unsaid. The first, "one leg shorter," is a fragment. We don't know whose leg it is until the second line, where "she" appears, walking into the speaker. Probably the shorter leg belongs to her, since it sits right beside the way she moves, though the poem never says so outright.
The words "walked into me" are doing double work. They could describe a literal bump, a small collision. They could also suggest that she entered the speaker's life or attention, almost by accident. "Early" adds another wrinkle: early in the day, early in a relationship, or perhaps earlier than expected.
The mood is quiet, tender and a little off-balance, which fits the uneven walk. The speaker doesn't comment or judge. He simply notes the detail and the meeting, and that plain, noticing tone makes the moment feel intimate and slightly surprising.