Dpreview has nothing but a spam commenter. Amazon has 400+ reviews, 4 stars so it's probably at least above average. B&H and Adorama have fewer reviews but they seem to agree with Amazon and put it in the 4-5 star range.
AA batteries is a potentially huge plus when traveling and you somehow lose a charger or something. AA batteries are sold worldwide as standard.
Also, the guy who suggested looking at a Canon S100 and P310. obviously did not look at the zoom range at all; he's talking in generalities without looking at the actual camera for clues as to what your SIL wants. If your SIL really wants a superzoom, get her a superzoom. If she wants low light performance in a relatively compact camera, a S100 isn't that great (I have a S95 which is basically just as good as the S100 in low light, which is to say, it's not THAT much better than other small-sensor cameras, so you'd want a LX7 or RX100 if you really want decent low light performance).
If she is really serious about photography and doesn't care about limited zoom range, you can get used/refurbed DSLRs with kit lenses that perform about the same as the LX7/RX100 in low light (due to the slowness of the kit lenses) but they might not be any cheaper and take up more space/weight which matters a lot to some people; but the DSLR is upgradeable so if she's seriously into photography she can get other lenses.
Lastly if you do stick with the L810 you can get refurbished ones for $149 or less, e.g.,
http://www.adorama.com/INKCPL810BKR.html