Offered job

i am working with a woman who is “my boss” but she has no knowledge of how to approach the work and people – i have advised her many times to change tactic but shes very strong headed will shut me down or b rude anything that shows she has control over the situation/ppl/work anyway as she is away on holiday i have had some breathing space and autonomy to do the work as i deem fit as i mostly dont agree with her approach. but sometimes I have to bend.
recently i had an update with her manager and i just kinda told her the whole situation thats been going on for 2 months – her boss was not surprised and said she felt the same and she doesnt think shes fit for the job. then she offered me her job but i didnt say anything !
1. i feel bad i dont want to step on anyones toes for their livelihood – is this what i am doing by stating facts about her poor and lack of approach and resistant to change mind you if i dont state this now then the work doesnt happen even i will get blamed and get a poor profile.
2. if i get offered the job again explicitly should i take it – i mean from islamic point of view im not doing anything wrong am i?