Strangely enough, even though I am not a woman and I have normal size feet, I have something for you.
The only bicycling related item I don't buy at my local bike store is shoes. The selection and size availability is alway pretty weak. I have bought a couple of pairs of shoes from Competitive Cyclist and was really happy with their service. I went online to see if they had any women's size "tiny" and they did :http://www.competitivecyclist.com/womens-road-bike-shoes?p=size%3A4.0
They also have a NQA return policy. I once used it when some shoes I bought from them started bothering my feet 2 weeks after I got them. No problem w/ returning them.
Now, these are road shoes, but I think the majority of tourers use either touring shoes or MTB shoes. I got nothing for you on those. Also, make sure whatever shoe you buy works with whatever pedals you have (or intend to buy).
If you don't know the difference; road shoes have a very stiff sole and are pretty awkward to walk around in, they are for riding only. MTB shoes have some flexibility and a recessed cleat and touring shoes have more flexibility yet and are closest to a street shoe.
Even when I'm touring I still use road shoes, they provide the most efficient transfer of energy. Then when I get to the store / restaurant / hotel I keep a pair of running shoes handy & I put them on. I can then blend inconspicuously with the locals....well, except for the lycra shorts.