Paul writes in 1 Corinthians v 9 & 10 "...God said to me, 'My grace is sufficient for you, for My power is made perfect in weakness.' Therefore I (Paul) will boast all the more gladly about my weaknesses, so that Christ's power may rest on me. That is why, for Christ's sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong."
Look also at Moses and Gideon who achieved amazing things, they both started by telling God that He had got the wrong person for the job. Look at the people Jesus called as disciples - they certainly were not called because they were superamazing people. God calls ordinary people to do extra-ordinary tasks - but here is the thing - we do those tasks WITH God, in HIS strength and by HIS power. It is not something we achieve on our own.
- visiting or phoning to see how she is and letting her talk if she needs to,
- sending her text messages or notes of encouragement so she knows that she is not alone,
- making a meal for her family so that she has time to rest,
- babysitting (even for a short time) so that she can have some space to catch up with herself or her husband,
- actively praying for her, her family and her child
- when you are going grocery shopping, phoning her and asking if you can do hers at the same time (I'm not talking about you paying for the shopping, but the act of doing to shopping so she has more time)