iOS Apps crashing all the time on iPad mini2

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GODMODE09

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Hi,
I have iPad mini retina 16gb. It is still running iOS 7.
I didn't update to iOS 8 because it said I need 7gb or more free space and I have only 2gb out of 12 gb I get in the 16gb version.
Now all the apps, mainly safari and chrome and other apps crashes and closes all the time.
iPad is also lagging all the time when switching from landscape to portrait.
I don't have a PC to backup and update and I can't delete stuff also.
Have 2gb free space.
What are my options. How do I stop apps crashing or update to iOS 8 with 2gb free space ?
 
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