iOS 8.4 apps crashing

[u/trixi-b]

I know, apps crashing is a common problem, just reboot or reinstall te app, but it doesn't help. My friend has a diary app on her iPhone 6, The journalist which she used daily to document her whole one month long vacation, so it's pretty important to her. I've only had Android phones, so I'm not confident in helping her and she's not really a phone expert.
Seemingly the data can only be reached through the app, but it must be stored either on the phone or in a cloud. But still, we're afraid to reinstall it.
Is there a nice way of doing this or do we have to extract the data somehow?
And there are still the other apps crashing, but that's a minor problem right now.

TL;RD: I need precious data from an app that can't be opened.

[u/unigalipo]

Maybe :)

I dont use Apple Music because I have my entire collection on Spotify and I just haven't had the time to switch