Congratulations on your hard work in high school and to your mom for her excellent saving! $90k saved for your college education is a huge gift, especially since it can help you to start life out debt free.
As others have mentioned, it’s best to consider the $90k the budget for four years rather than two. If it took 18 years to save up $90k, it would be tremendously challenging to do the same in 2 years. And with $90k saved, I don’t think either you or your mom will need to take out loans.
Right now I’d say your budget is about $22-23k for tuition, room & board, as additional expenses like books, travel, etc can either be earned by you with a part-time job or cash flowed from your mom’s income.
The Net Price Calculator is your friend, especially if it asks for your GPA or other academic info, as that is likely to provide the minimum you would get in merit aid, which is great for trying to see which schools will or are likely to meet your budget.
Also, I wouldn’t limit yourself to only aerospace engineering, as mechanical engineering is also an excellent route into the field, and some ME programs also have a subspecialty in aerospace. Majoring in ME won’t limit your aerospace possibilities, but will also open up other avenues should you change your mind in the future (and open up the possibility to more colleges to meet your budgetary needs).
UIUC’s total cost of attendance (including books & miscellaneous expenses) is between $33-38k/year, according to its own website. Run the NPC and see what happens, as in-state publics are most generous with their own residents.
I’d take good, strong looks at Northern Illinois and Southern Illinois (Carbondale & Edwardsville). I think Edwardsville will already be in budget at sticker price, and I’d be shocked if you didn’t get sufficient merit aid at any of the three to bring the price fully into budget.
I’d also run the NPC at Illinois Tech and Bradley as well as talk to their admissions officers, as there may be some scholarships for in-state students as well as for under-represented minorities (URM) or first gen students.
Some other schools that I’d take a look at include:
U. of Alabama - Huntsville
U. of Central Florida
U. of Houston (TX)
U. of Texas - Arlington
Embry-Riddle - Daytona Beach (FL) - private
Florida Polytechnic
Florida Tech - private
U. of Hartford (CT) - private
Florida and Texas publics are known for giving out-of-state waivers to strong out-of-state applicants, and if you got one all of those publics would be in budget. Also, I would run the NPCs at the private schools on this list as well. U. of Hartford’s site indicated that a student with stats lower than yours could get $23k up to full tuition. Hartford, like Huntsville, has a lot of local aerospace connections. Houston and Dallas/Fort Worth (where Arlington is) are also big in aerospace, and Florida’s space coast is another prime area. Going to any of these institutions would give you great proximity to many opportunities in the field.