All Might is scaled to:
https://vsbattles.fandom.com/wiki/User_blog:Therefir/My_Hero_Academia:_Detroit_Smash#Final_Tally
Detroit Smash: 161609021433500000 Joules, or
38.63 Megatons, 7-B, City level
Assuming I did my conversions right, since I dunno which end was accepted.... 7-B Chi Chi is scaled to Master Roshi via this:
https://vsbattles.fandom.com/wiki/User_blog:FanofRPGs/Master_Roshi_destroys_Mount_Frypa, as being slightly weaker than Master Roshu, using one of:
Average Height
Low End:
7.40563388 Megatons of TNT (30985172200000000 joules)
OR
Tallest Height
Low End:
31.7885421 Megatons of TNT (133003260000000000 joules)
So....
161,609,021,433,500,000 joules (All Might)
30,985,172,200,000,000 joules to 133,003,260,000,000,000 joules
Worst case scenario for Chi Chi, she's up against someone who's about 5.21 times stronger than her.
Best case scenario, All Might is still 28-point-six quadrillion joules stronger, or roughly one fifth stronger than her.
Chi Chi's helmet being restricted seems silly & cruel, as her 7-B key starts in the Piccolo Jr Saga, by which time she hasn't been seen using her helmet; Did she even ever use it again past that point?
But even if it WERE unrestricted & she was able & willing to use it in this key, she's still outclassed.
Chi-Chi: Range: Standard melee range. Tens of meters with lasers | Standard melee range
All Might: Range: Standard melee range. Several kilometers with shockwaves (The aftereffects of his Detroit Smash drew in a thunderstorm at least 5.3 kilometers away)
Oh, did we mention his Air Manipulation/Shockwaves, his Weather Manipulation & Pseudo-Flight?
Whereas Chi-Chi simply has Superhuman Physical Characteristics, Martial Arts & Lasers.
Let's compare other aspects.
Chi Chi:
Stamina: Superhuman
Intelligence: Combat Smart
All Might:
Stamina: High (Able to use One For All often, used to be able to act as a hero for more than 3 hours at a time)
Intelligence: It's really long so I'll just say he has much more combat experience & knowledge of how to use powers & physical abilities & if you want the rest of the details on his intelligence, read his profile.
TL;DR - All Might severely outclasses Chi Chi; Even scaling her to the best of the best feat she scales to, he's between around 20% stronger than her to FIVE-POINT-TWO TIMES (520%!) stronger than she is!
Not only that, he severely outclasses her in versatility/hax, range, stamina, & combat experience/ability.
I don't see how she can have any advantage here, other than maybe All-Might hesitating to kill a young lady, but being willing nonetheless,
& I dare say this might be a stomp that's just what it looks like: A veteran pro hero putting a blemish on his shining record by beating the living daylights out of a mostly innocent house-wife.
So, stomp or decisive victory?