I have installed the add-on which shows the actual numerical value of your Rapport with a Companion.
After having read conflicting reports of whether Mirri gained 75 or 5 Rapport from seeing completed collectible "museum" displays, I got the following results (which seem to explain the discrepancy):
North Elsweyr Rihana-di-Renada: 75 for visiting it the first time, 5 every subsequent.
South Elsweyr (Dragonhold) Tapestry: 75 the first time, 5 subsequent.
Hews Bane (Thieves Guild) Hit List: 75 the first time, 5 subsequent.
Vault of Moawita (Summerset): 75 first time, not yet visited second time
Vivec Library (Morrowind): 75 first time, not yet visited second time
Solitude Bards College Instrument Collection (Greymoor): 75 first time, not yet visited second time
Am not expecting any response to:
Blackwood Tapestry - a one-off piece of furniture which has to be hung in the home, and you do not have Companions with you at home (even if you place them there as furniture items)
Clockwork City Precursor - ditto. (She also does not react to it in Zanon's Workshop: but then, after the quest is complete, the shelf is empty.)
Litany of Blood pedestals all filled - She hates the Dark Brotherhood and murderers, so is hardly likely to be pleased at this.
BUT...
Murkmire Xinchei-Konu Calendar Tablets: NO REACTION
Surely she should be impressed by seeing that particular reconstruction, which is the same kind of thing as most of the other above displays that she *does* react to - a character-specific in-game display of things that were collected from all over the realm?
I suspect this is in fact an oversight, and Mirri should react to seeing the Xinchei-Konu calendar as a collectible museum piece.