manda hon, when things are discussed calmly and lovingly, where there is no blaming (on either of you), then how would it hurt hon? she may very well be upset that you read her diary....but she also may be relieved once the two of you can discuss things together as loving sisters.
_Sky makes an excellent point about the blame thing.....being depressed is nothing to be blamed for...it is something that happens physiologically in one's brain, people don't wish to be depressed hon.

sabby