A good song about tough times, and things getting better?

So my mom has been really stressed out lately about money, and she's been really busy and stuff. today she got in a really big fight with her boyfriend because of all this stress. So i need a good song that will brighten up her day tomorrow if i post it on her facebook wall. something about how life may be tough but things will get better. Oh and she likes country, pop, 80's rock, modern rock, and alot of stuff just not so much rap or hard core rock. thankssss!!