Visiting most of the village houses will just spawn reinforcements. However, these summoned enemy units may also have dropped loot so it's worth deliberately summoning them and defeating them for loot and EXP. The only dragon vein is located near your location which will freeze the lake and allow you to pass through.
The archer and sorcerer that will be summoned by visiting the first house will drop a Surefire Bow and a Master Seal respectively. The second house will summon a mercenary with a Spirit Katana. The kid inside the house in the middle-north part of the village can give you 10,000G. The house in the SW corner of the map will summon a small group with a maid carrying a Sun Festal. Finally, the house in the middle west will summon a dark mage with a sheep spirit.
At the start of the third turn, more reinforcements will appear near Flora's position. One of the sorcerers to the SW has an Elixir that can be dropped, another sorcerer near Flora is carrying 5000g. One of the maids near Flora also has a Silver Shuriken. Once you're done sweeping the village and looting the valuables, you can surround Flora and attack in one fell swoop. She won't be moving from her position and will only react if you entered her attack zone. Avoid attacking her with ranged weapons since her Icy Blood skill deal damage half the damage you deal to her to the attacker with debuffs on top of that. Aside from that, she doesn't have any other dangerous skills you should look out for so surround her with your melee units and finish her off.