The reason she didn't choose those tanks and artilleries was because they were only able to give her short-term benefits and they cost a lot of materials. Monsters and players would not forever stay weak. They will gain more stats as time goes by.
[Greenhouse, Bronze Grade (Tendra Civilization)
-Prerequisite: Basic Farm
-Area: 50 square feet, 3 meters in height.
-Accelerate the growth of crops by 10% and improve the quality of harvest crops by 10%.
-Required Materials: 5 units of metal blocks, 20 units of wood, plastic film (55 square feet)/ polyester/ rigid glass/ screen net/ or any light materials.]
There should be suitable materials from the loot in the textile. The growth and quality boost were good.
[Defense Wall, Bronze Grade (Tendra Civilization)
-Prerequisite: wooden fence
-Size: 2 meters wide, 3 meters high.
-Function: Negate 50 points of physical and magical damage.