Here are some lyrics to songs(all done by Cher, my favourite) that might fit some feelings and situations Bella is in.
First one:
All or nothing
When Edward just leaves Bella and she runs into the forest. In New moon.

I've been standing out in the rain
I've been calling your name
Got that lonely feeling again
Calling out your name
Do you hear me? Do you want me?

Chorus: Baby, it's all or nothing now
I don't wanna run but I can't walk out
Your'e breaking my heart if you leave me now
Don't wanna wait for ever
Who do you think your'e fooling? Who do you think your'e fooling?
Baby, it's all or nothing. Baby, it's all or nothing now

I've been trying to get to your heart
But I'm chasing shadows
We keep falling further apart
So near and your'e so far
Do you care now? Do you know how?

Chorus

Sometimes, when you touch me, I just can't help my self
Can't help my self...
Desire makes me weak, me weak.
Desire makes me weweweweak.

Chorus

Second one:
Alive again
Just before Bella meets Jake in New moon.

All alone I must stand even when I'm running
And it feels like a dream I need to awaken from
I believe when it hurts we must keepon trying
But I want and i need like a river needs the rain

There's a bridge I need to burn before I leave
I just wanna breathe again
Like a summer's day I need to feel the heat again

Chorus: I only wanna keep the stone from rolling
I only wanna learn to feel the rain
Then maybe I can stop the leaves from falling
I only wanna learn to freeze the flame
I know I be alive again, I wanna be alive again

Here's the night, where's the stars? Cause I need some guiding
And it cuts like a knife as I watch you walk away

There's a bridge I need to burn before i leave
I just wanna live again
Like the stormy rain I need to hear it beat again

Chorus

Cause I did my best, baby who'd have guessed that I've failed the test
Cause when love ain't blessed and it's laid to rest it can leave a mess

Chorus

Third and last one:
Love can build a bridge
When, in Eclipse, Bella choose Edward instead of Jake.

I'd gladly walk across the desert with no shoes upon my feet
To share with you the last bite of bread I had to eat
I would swim out to save you in your sea of broken dreams
When all your hopes are sinking let me show you what love means

Chorus: Love can build a bridge between your heart and mine
Love can build a bridge
Don't you think it's time, don't you think it's time?

I would whisper love so loudly every heart could understand
That love and only love can join the tribes of men
I would give my hearts desire so that you might see
The first step is to realize that it all begins with you and me

Chorus

When we stand together it's our finest hour
We can do anything, anything, anything, anything
Keep believing in the power!

Chorus

Well, that's all from me. See ya!
//Leida