"She is teaching you how to read."
Translation:Elle vous apprend à lire.
Unlike "apprendre", "enseigner" needs a noun as an object:
Elle vous enseigne la lecture
Elle vous apprend à lire
In general, "enseigner" is used for teaching in general (like "I teach for a living") or for teaching a particular subject (like "I teach French to teenagers"), whereas "apprendre" is used more for teaching a skill, like in this case, reading.
The subject being "elle", the conjugaison for a 3rd person singular subject is "apprend".
Please learn the full conjugation of the verb "apprendre" in present:
- j'apprends, tu apprends, il/elle/on apprend, nous apprenons, vous apprenez, ils/elles apprennent.
"Elle t'apprend à lire" is accepted.
Note: You have to conjugate apprendre to go with the subject, elle.
Only the second verb, lire, is left in the infinitive.