NOOOOOOO, I WAS JUST RESPONDING TO YOU, WOMAN!! XDD
What I was saying BEFORE YOU CHANGED YOUR ANSWER xD was that there are some valid points in Frank being suspicious - at least more so than others, since he is quite observant. A key point could be that she arrived when Metatron was unwell and that, while he hasn't said anything against her being there, he certainly hasn't said much about her in general. (However, I admit, this all depends on what the Mod does with him, so I can't say for certain.)
My curiosity and questioning of Frank's suspicions just came from wondering what would trigger said suspicions and making sure that it was something he could really use. <3