"Jesus came and took her by the hand and lifted her up. Then the fever left her and she began to serve them."
Sometimes there is a line in the Gospel reading that really packs a wallop. Like this one, for example. This is about Simon Peter's mother in law, who was ill, and cured by Jesus. As with so many things in Catholicism, this passage has great depth of meaning. At face value, Jesus' healing touch cures her, so that she can get up and feel well enough to go about her duties, cooking a meal. Let's look at it in the light of our own lives.
"Jesus came" ... We can start by allowing Jesus to come to us; in our homes, in our hearts. If we are ill, and can't go about our daily life as we used to, or if we are spiritually dry and no longer attend Mass or pray, we can open our "doors" and let Him in. We can turn to Him. He can't help us if we don't allow Him to; ask and you shall receive. In His mercy, He will come to those who have not hardened their hearts against Him.
..."and took her by the hand"... He reaches out to us; it takes trust and faith to put our hand, our lives, into His hands. Whenever I think of this line, I imagine the joy and relief of holding on to those precious nail-scarred hands, knowing that it would never be Him that would let go.
..."and lifted her up"... He can take us beyond the realm of our misery, He can give us the grace we need to either overcome our illness of mind or body, or to recognize it as a grace in that it becomes a share in His suffering for us.
"Then the fever left her"... Our attachment to sin leaves us when we allow Jesus into our life. Darkness flees from light, and our willingness to turn to the healing touch of Jesus loosens the grip of evil in our lives.
..."and she began to serve them." When we receive a gift, we give thanks. We can all do something to return the grace we have received; for some it is praying and doing penance; for others it may be grander things, but all of us are called to serve God. Note that she served them right away; she arose and prepared a meal, did not keep them waiting. Don't keep God waiting for your thanks and praise; throughout the day and even in the night you can offer Him your thanks. Serving God is to humble yourself, and the reward is heaven.