It can mean easily or comfortably or conveniently or somewhere along that line. Hmm I'm curious what the entire sentence was though. If you could let me know the entire sentence, I could probably give you more accurate answer.

I think "in comfort, comfortably" are best suitable for 편히. She is walking in comfort/comfortably. 그녀는 편히 걷고 있다. She is talking on the phone in comfort/comfortably. 그녀는 편히 전화로 통화하고 있다. She lives in comfort/comfortably. 그녀는 편히 산다. I hopr it helps you.