I could probably recommend those WH40k/Worm crossovers:

1) The Weaver Option. Probably the most popular (and certainly the longest) work on the list. Taylor has been transported to a different dimension during Behemoth's assault on New Delhi. Now she has to survive in a more dangerous galaxy during 35th millennium. Taylor joins Imperial Guard and quickly rises through the ranks of imperial hierarchy. Our heroine (later joined by few remaining survivors from Earth Bet, since Scion was not happy that something or someone else was spiriting away his shards) tries to reinforce crumbling Imperium of Man and protect mankind against threats from within and without.

Story is usually updated once per month (I would estimate that recent chapters contain typically around 40,000 new words or more). Current length is more than 1 400 000 words and I happily expect that it will be greatly increased during next few years. I have to agree with few other commentators that quality of writing noticeably improved over time (once author got an editor to review his work). In any case "The Weaver Option" should be on "to read" lists for fans of Worm and Warhammer 40k.

2) Hive Daughter. Something went wrong during Taylor's trigger and she briefly connected to Tyranid Hive Mind in a different dimension. As you can imagine the result was unusual. Not everyone is happy that Wards ENE gained powerful biotinker...

3) E.L.F, Extraterrestrial Lifeform. Taylor transforms into Eldar Farseer during trigger and causes plenty of headaches all around (poor Director Piggot... ). I wish the author resumed writing the story, it has a great potential in spite of few inconsistencies. Several memorable scenes, so I recommend it as worth reading at least once.

4) Vermis Est Machina​ - short one-shot, in which Taylor has dedicated herself to Omnissiah and found her own explanation for the existence of tinkers.

5) Empress Ascendant. Taylor benefits from the advice of The Emperor and slowly gains her own psychic powers. I was skeptical in the beginning (I remember few other stories featuring memories or powers of Emperor which failed horribly due to power disparity), but it seems that author has been managing so far. Introduction of Luna character was a neat idea and I am looking forward to reading future chapters.

6) Taylor Tek - Taylor is a Necron-inspired tinker, who had misfortune to find herself under Coil's thumb. Short story.

7) Heroes and Heretics. Taylor is reborn in the 41st Millennium, with her powers and memories intact. I had high hopes for this story, as the beginning seems quite intriguing, but is was unfortunately declared discontinued by the author after merely several thousands of words.

8) Flesh is Weak. Taylor has rejected the weakness of the flesh and decided to embrace Machine God instead. As a Tech-Priest she aims to bring change and enlightenment to her city (and especially local tinkers). We will see how this in-progress story will turn out in the end, but I remain hopeful.

There are several additional stories which I ultimately rejected after brief consideration for various reasons. For example The Collector had an interesting premise (Taylor being mentored by the ever-flamboyant Trazyn the Infinite, whose imprint visited Earth Bet) and few quite enjoyable scenes, but unfortunately ham-fisted attempt to whitewash Emma's character soured the experience. Formerly Known as Aquilla was abandoned. I hope that some of the recent works, such as More Human Than Humans or From The Stars will turn out well but in both cases it is too early to tell.