@Heathen I'm relatively certain Janelle would read fairly ordinarily. I don't know if she's had genital reconstruction surgery, but I doubt Lucas pays close enough attention to these things, like seriously, who would even want to? (don't answer that) Soooo, moving on from there to her powerset. First off, being invisible, Lucas would certainly not be able to see her. But unless she's naked at the time or in a crowd, he'd probably still notice that she's there. Or well, her clothing. So, if she winds up having an outfit or item she wears/carries with her a lot, he might be able to tell she's around regardless of how much other 'noise' he's getting. Though it might take him a moment, and he'd be very confused if he couldn't see her. :P
I did wonder about her forcefields though, as energy can sometimes disrupt or distort other energy. I don't really have any sort of scientific explanation for Lucas' psychometry, but given as there's a broadcast thing that occurs, I'll assume that it can be disrupted by some things, at the very least. If you'd like, we could look into Janelle's psionic energy being one of those things? It'd probably require pretty specific circumstances to discover, but that's what plotting is for. ;)
It would depend on how experienced your Minerva type is. Average Minervas will not be able to sense her at all while she's invisible, even belongings she's carrying as she can extend her power to anything she chooses. Now someone like Serena will be able to 'see' her without so much as breaking a sweat.
As far as her forcefields, that's a matter of debate we can discuss later. However her force projections are made of the same energies that grant her invisibility so I would assume it would interfere with Lucas' ability in some type of way.