Talk:Saint Martha/@comment-2A00:1028:8B40:27AE:657B:F37C:F7F8:6BF-20180203122423/@comment-209.141.124.179-20180203135615

It will only upgrade her 2nd skill. You will not unlock the third skill until part 4 comes out. http://fategrandorder.wikia.com/wiki/Servant_Strengthening_Quests_Part_IV#Day%204