For my indoor amplified antenna, metal objects in the room did make a difference, if I were pointing the antenna in that direction and very close to the metal. I am new to OTA, but I'll share what I learned by doing re indoor antenna and analog:digital signals.
First, the best place for the antenna is not the same for digital as it was for analog. Get a longer coax cable, and move around the room. There were surprises!! Once you know what's good for the hard signals, you may find a place where they all work. A nice feature of this model is the audio signal. But I also like going into Setup to Manual Tuning, where I can scroll through all possible real frequencies (ones already found are bolded) and if I find a weak signal, then I go walking. There is a lag time, go slowly.
Secondly, channels 4 and 5 are broadcasting both analog and digital. Pass through would get you the analog versions only only until Feb 17. These are not low power stations, they will go away then. Both 4.1 and 5.1 are UHF real frequencies, and stay where they are after Feb. Lengthening rabbit ears is only for VHF signals, it won't help you find these two. When I go looking for UHF signals, I get the rabbit ears out of the way.
Channel 4.1 real frequency is UHF 35, and channel 5.1 is UHF 41. I'm no expert, but a potential problem is that you have adjacent channels on 36 (27.1), 40 (39.1), and 42 (68.1). Someone who understands this will need to comment, I don't know why they weren't marked "a" on TVFool, so I may be missing something. One possible solution could be getting a CECB with a dual converter tuner -- Microtune-- a Plano company -- but I'd wait for an expert to comment here, too.
One other thing I don't understand is why you get such wildly different results from antennaweb vs. TVFool. For antennaweb coding, indoor antennas do pretty well with yellow, and you may get the greens. Your signals show as mostly blue, which I can't get indoors. And yet, the TVFool chart shows LOS, <20 miles, strong signals in the -46 to -55 dBm range, which should be great with an indoor antenna. If I had that, I'd have to turn my amplification off. You could see what happens if you do that, turning off the switch, but it has to stay plugged in. For me (weaker signals than you) the amplification only helps in my one bad room where the outside signal is blocked in all directions.
On supply, the coupon fulfillment center provides zipcode info to the retailers, so they can anticipate and stock up. But what happened was, there were so few box models actually manufactured, that people waited for ones with features they wanted. I think it will get better. Part of the mfg delay was a last minute decision to allow analog pass through, so there was a scramble to add that to the products. Zenith/Insignia got FCC approval for a pass through model on March 12, but it isn't out yet. With RS, I looked online, and the stores in stock changed a lot, daily. I suspected one of the reasons for the slowdown is they want to save inventory space for other models.
For your friend, all the analog stations listed are currently broadcasting digital. To see if there are any stations she would want that will stay analog, look at the post transition analog chart -- TVFool doesn't show all the analog when you look at the combined lists. If you had analog pass through now (or an A/B switch setup) she could still get the analog 4 and 5m, but that does her good only until Feb 17. The digital ones seem to be running at full power already. You could compare TVFool digital signal strength now vs. post transition charts, to look for expected impovements in signal. Just having the airwaves cleaned up a bit could help.
Good luck, you're a good friend to help out.