[tejasm]

If she's looking just at the posting part, she should try Buffer/SocialPilot.co/HootSuite. That should do the trick. If she's looking to monitor for replies and engage with the community overall, then she might need to use more than one tool.

[GFischer]

I was going to mention HootSuite too.

A quick Google search will find you lots of alternatives (apparently https://kuku.io/ as well as Buffer & SocialPilot that tejasm mentioned)

[tixocloud]

Do these tools provide ways for engagement on social media as well? They all seem to be schedulers/automation tools.

Also, do they do email as well?