Jamieson, Fausset and Brown on Luke 10:40

40. cumbered--"distracted."

came to him--"presented herself before Him," as from another apartment, in which her sister had "left her to serve (or make preparation) alone."

carest thou not ... my sister, &c.--"Lord, here am I with everything to do, and this sister of mine will not lay a hand to anything; thus I miss something from Thy lips, and Thou from our hands."

bid her, &c.--She presumes not to stop Christ's teaching by calling her sister away, and thus leaving Him without His one auditor, nor did she hope perhaps to succeed if she had tried.