conuly

If she's got a time machine, she'd do better to go back and rescue a bunch of incredibly valuable antiquities that have been lost to history. For sure, kipe as many documents as possible from the Library of Alexandria the night before the fire - leave them to age in some safe place, such as a cave in the Mojave in 500 BCE; retrieve them when they're the proper age, then go back 200 years or so, buy some steamer trunks and age them. (Of course all this aging of stuff for centuries is a matter of moments for someone with a time machine.) Put the ancient documents in the antique trunks and hide them in some plausible place where you can 'discover' them with no possible dispute to your claim of ownership.

What it would look like would be that some unknown, long-dead person had found and hidden these documents before, say, WWI, when all kinds of valuable antiquities went missing. Sheesh, go on a burglary spree in Dresden, the night before the firebombing - all those people are going to die anyway, and all their stuff be destroyed. In fact, with a time machine, one could go rob Dresden the night before the bombing as many times as one wanted, and make whatever arrangements one wanted in order to legitimately inherit everything in due course of time, with all the proper documentation.

... artifacts from Peking, the night before Genghis Khan sacked it. Artifacts from Troy, Carthage, Babylon, Chichin Itzil... all those mighty, vanished cities of the ancient world, all that wonderful stuff that disappeared and was never found... granted, the atoms of the elements comprising all those items would be taken from one time to another, so there would still be a great big paradox: a gap of however-many years during which those atoms didn't exist.

Therefore, it might be best not to try to transport material objects from one time to another at all, and instead only go to gather information about what is where, and/or hide things in safe places in their own time, where one will be able to retrieve them in one's own time. For that matter, one could go back in time and move them if necessary - if ever one found them missing, one could go back to before they were missing and move them somewhere else. The only caveat would be to only hide items that one knew to be subsequently destroyed, or that were never found up to one's own time, so as not to interfere with human history.

As you know, the Vulcan Science Academy has determined that time travel is not fair. ("Thanks, Captain Obvious!") With this in mind, the odds are very much in favor of something going disastrously wrong no matter how one tries to work it. Probably safer to just drink less coffee.