I'm playing a game and have recieved a quest from the"Office of the Watch" @ Temple in Vivec. I think it's part of a mod, but i'm not sure. I killed her but did not get a JE. Can any one help?

GameFile0=Bloodmoon.esm
GameFile1=Book Rotate.esm
GameFile2=BT_Whitewolf_2_0.esm
GameFile3=GDR_MasterFile.esm
GameFile4=MCA.esm
GameFile5=Morrowind Patch v1.6.4.esm
GameFile6=Morrowind.esm
GameFile7=Tribunal.esm
GameFile8=Weapon Rotate.esm
GameFile9=Almalexia_Voicev1.esp
GameFile10=B79_RacersRoost_v1.1.esp
GameFile11=Better Bodies.esp
GameFile12=Buyable Hlaalo Manor.ESP
GameFile13=Census and Excise Office.esp
GameFile14=Clean Hall-of-Heroes-Expansion.esp
GameFile15=Clean PJM Themed bowsets.esp
GameFile16=Grandmaster of Hlaalu.esp
GameFile17=HospitalityPapers.esp
GameFile18=k7_auriels_bow.ESP
GameFile19=k7_auriels_bow_TRIB.ESP
GameFile20=Kahleigh's Retreat v1.1_BMTB.esp
GameFile21=LadyD_Reduced_Commentary.esp
GameFile22=Less_Generic_Bloodmoon.esp
GameFile23=Less_Generic_Nerevarine.esp
GameFile24=Less_Generic_Tribunal.esp
GameFile25=LGNPC_Aldruhn_v1_13.esp
GameFile26=LGNPC_AldVelothi_v1_20.esp
GameFile27=LGNPC_GnaarMok_v1_10.esp
GameFile28=LGNPC_HlaOad_v1_32.esp
GameFile29=LGNPC_Indarys_Manor_v1_45.esp
GameFile30=LGNPC_Khuul_v2_01.esp
GameFile31=LGNPC_MaarGan_v1_11.esp
GameFile32=LGNPC_NoLore_v0_83.esp
GameFile33=LGNPC_PaxRedoran_v1_12.esp
GameFile34=LGNPC_Pelagiad_v1_13.esp
GameFile35=LGNPC_Secret_Masters_v1_21.esp
GameFile36=LGNPC_SM_MCA5.esp
GameFile37=Lgnpc_SN.esp
GameFile38=LGNPC_TelMora_v1_11.esp
GameFile39=LGNPC_TelUvirith_v1_10.esp
GameFile40=LGNPC_VivecFQ_v2_03.esp
GameFile41=LGNPC_VivecRedoran_v1_42.esp
GameFile42=Librarian with Jackets & Rotate BM Trib.esp
GameFile43=Mannequins for Sale.esp
GameFile44=Master Index Upgrade.esp
GameFile45=master_index.esp
GameFile46=Nevena's Twin Lamps & Slave Hunters 1.5.esp
GameFile47=Real_wildlife_2b Complete.esp
GameFile48=Solstheim_mage_towerV3_0.esp
GameFile49=South Wall.ESP
GameFile50=SW_ASE_ADDON.esp
GameFile51=SW_MCA5.2_Patch.esp
GameFile52=TavernTime Vardenfell.ESP
GameFile53=The Imperial Legion Badge.esp
GameFile54=The Latest, Greatest Housing Mod_GOLD.esp
GameFile55=Vality's Bitter Coast Addon.esp
GameFile56=Vivec_Voice_addon TRIBUNAL.esp
GameFile57=Wayfarer's Rest v1.21.esp
GameFile58=Weapon Rotate - Bloodmoon.esp
GameFile59=Weapon Rotate - Tribunal.esp
GameFile60=Weapon Rotate - Vendors.esp
GameFile61=WeatheredSigns.esp
GameFile62=Windows Glow.esp
GameFile63=Wolf Manor 2.5.esp
GameFile64=Wolf Manor bloodmoon addon.esp

That's a vanilla Morrowind quest. She was in the sewers right? Did you go back and talk to wuest giver?

Yes. He just talked like he was giving me the quest originally.

What is the exact line he says, and who did you kill? There is not supposed to be a journal entry until you report back. I can't see any obvious mod conflicts there.

Try having a look http://www.uesp.net/wiki/Morrowind:Mysterious_Killings_in_Vivec. Try the console codes if you have to.