Translation:She is forcing me
According to the lesson introduction lazima is an adjective meaning mandatory. Must is either a noun or a verb. Also according to the introduction Kulazimisha means to compel or persuade, but 'he persuades me' is not accepted, which quite different from 'he forces me'. Reported Nov. 2018.
If in doubt, break it down and see if you can't work it out for yourself:
A --> Subject prefix "(s)he"
Na --> Tense marker "present"
Ni --> Object infix "me"
Lazimisha --> Verb "to force"
In this case it's the causative form of the verb lazimika, "to be compelled/forced".