Darn it, I just wrote a whole two paragraphs for you and then the page refreshed/timed out for some reason. Why does it do that?

Oh well I’ll type it again.
I guess with a broad interpretation you’re trying to find patterns and recurring themes. Every author has their own set of ideas. With Woolf I suppose there is a lot in her writing to do with feminism, the need to communicate, the beauty in moment, humanity beyond the pretence of society and so forth. At least that’s what I picked up. (But your interpretation is really up to you.)
For example, in Mrs Dalloway I’m sure you already know how there is this constant mention of age, death and decay. So you could say that these are recurring ideas and they are all linked to this umbrella concept of “Time”. You can see how this is a broad interpretation, right? Because it’s so big, you can apply this idea of *time* to nearly any given passage within the entire novel. However this interpretation is also *complex* since you can use this “big” idea to analyse these passages in detail.
So, for instance, you could mention how time causes change for characters and their society - this is a broad, blanket statement. Then use evidence within the passages, and draw an interpretation that is more detailed eg : that there is a perpetual struggle against objective forces of time and establishment. You see how any passages that crop up will link to your broader interpretation, but more complex ideas arise from this?
I hope that helped…:) Let me know if it didn’t. I'm still learning too.