I've been asked a couple of times how strong Taija is in the Power, so for those who are interested in the numbers and a bit more detail, here you go. If you want to just find out based on the narrative then ignore this chapter. Unfortunately there's no way to put spoiler tags on this platform.
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Strength in the power: 4 (roughly equivalent to Moghedien in raw strength).
Elemental affinities:
Strong in: spirit, fire, earth, air
Weak in: water
(Strength in elements is of course a bit relative given her overall strength)
Talents/Skills:
In terms of her strengths and Talents, Taija was never particularly known in the Age of Legends for her channeling. This has been seen already in at least one flashback where she was severely underestimated. Partly that was issues of attitude (she didn't really give off the "vibe" that most high tier channelers did), partly that her professional uses of the Power were highly esoteric and more about subtle control than raw power (things like working out better weaves to measure sub-atomic particles) and partly because she didn't really take part in aes sedai politics or networking. She was also a little bit of an oddball.
That being said, her strength in the Power was pretty significant, even in the Age of Legends when strong channelers were more common. If she was in a room, unless it was in the Hall of Servants, she was probably the strongest one there.
Another reason why pre-War she wasn't well known even among channeler fan-clubs (because those would absolutely have existed ) was a relative lack of flashy Talents (capitalised). Because of the obscurity of what she did and her not being all that public a figure outside academic circles, for most people there wasn't anything they would see that they could mark out as being exceptional about her, other than raw strength, which wasn't on the level of the true power-houses like Lews Therin, Barid Bel or Mierin Eronaile.
However, like most channelers with her level of strength she is able to do most things very well, even if she doesn't have a Talent allowing her to do more than you would expect with her strength. That doesn't apply to everything though. For example, an exception to this is healing where she doesn't have much skill at all (maybe healing a small fracture or cuts/bruises at best).
She does excel at a few things (arguably unequalled even in her time). In particular, she found it very useful for her career that she had a level of fine-scale control over saidar that virtually no one could match.
She's also exceptionally fast, something that didn't really get noticed until the War because unless you were a professional Power-athlete speed of weaving wasn't all that important. This is probably the other side of the coin for the fine control over her channeling. Her ability to invert multiple, complex weaves at combat speeds is very unusual.
Accompanying that is a very strong instinctual understanding of saidar, combined with a classical AoL education. If she sees a weave she can probably replicate it and explain it and there's a decent chance she can tell you exactly how she would improve on it.
While she has the general AoL channeler education, she has a very deep knowledge of anything and everything in her professional field (theoretical physics). This can lead to some pretty esoteric weaves, but most of them aren't super useful in a renaissance society (the need to measure sub-atomic particles just isn't there). She has made one or two more… "applied" uses of her knowledge so far though.
In general, the most useful thing for this is probably a deep knowledge of metaphysical and physical weirdness. She thought she could work out how the Ways were made after a conversation with Loial, she could absolutely recreate the bore if given the resources (not that she would).
She also has the kind of level of general knowledge that you'd expect of an intelligent, highly educated person in a high tech society.