Everyone is probably hung over this morning...

At 5 foot 4 finding a bicycle that fits well always presents a little more challenge... for commuting I would suggest you seek a small road frame and convert that with a fixed wheel set.

Benefits would be better clearance for fenders, provisions for a rack and cargo, and the toe overlap issue will be reduced... as you are looking at a flip flop and sounds like you will be running SS front and rear brakes are also essential.