There are TSA thread cutters out there. https://www.amazon.com/Clover-Thread-Cutter-Pendant-Antique/dp/B000YQH0K8/ref=asc_df_B000YQH0K8/?tag=hyprod-20&linkCode=df0&hvadid=167125073482&hvpos=&hvnetw=g&hvrand=17676156666749142653&hvpone=&hvptwo=&hvqmt=&... Not sure if pins are not allowed if needles are? Instead of pins you can give her wonder clips to hold things too.
A non nail-clipper, non-sewing scissor alternative is a Thread Cutter Pendant. Some airports disallow nail clippers.
Amazon came up with this one: https://www.amazon.com/Clover-Thread-Cutter-Pendant-Antique/dp/B000YQH0K8/ref=mp_s_a_1_6?crid=VTT0HYZ2ZBQL&keywords=thread+cutting+tool+necklace&qid=1668658405&sprefix=thread+cutting+tool+necklace+%2Caps%2C299&sr=8-6
I remember my mum used to always have this problem having her embroidery scissors confiscated at the airport! She bought a clover threadcutter years ago and still has it now it’s brilliant!
Maybe a better comparison would be consenting to a search of your car. In the two states I've gotten my license, refusal to take a breathalyzer is an automatic DUI. But a cop has to have reason or consent to search your vehicle. A lot of people will say to just give consent if you have nothing to hide because it's easier. But this just opens a window for the cops to find any small matter of incriminating evidence.
As a teenager, a cop strong armed my friend into giving consent to a search because we were parked and watching a hurricane roll in (very small town, it was that or hanging out at the Walmart.) Obviously, there was nothing in the car. But the cop tried to put the fear of god into us or something by insisting a pendant like this constituted contraband or paraphernalia because it had a blade inside.
Do the breathalyzer. Don't consent to search with out probable cause.
It really depends on the airport you're flying out of and the individual agents you interact with.
I recommend getting something like this to replace your nice scissors for the trip.
https://www.amazon.com/dp/B000YQH0K8/ref=cm_sw_r_cp_apa_i_5ArwFbVJFCFDM
I would say:
little scissors, possibly folding or in a case to prevent accidents; or use nail clippers or a thread cutter
big-eyed sewing needles -- some blunt ended and some sharp, for different circumstances (a needle threader may also help)
small pieces of different-coloured scrap yarn for using as markers
safety pins -- a quilting shop might have ones without the coil at the bottom which can trap yarn, but ordinary ones work fine; or some of the plastic stitch markers which work the same way, or even bobby pins. These are important because you can use one to clip onto a dropped stitch to hold it while you figure out what to do about it.
a crochet hook of a reasonably appropriate size for your yarn, to deal with those dropped stitches
a retracting tape measure
a clear plastic pencil or makeup case for keeping these things in
EDIT: Don't buy new needles/hooks the same as the ones you already have. Try different brands and different materials to find which ones you like best.
And remember that knitting/crocheting are cheaper than most other hobbies, and you get useful stuff out of it -- so there is no need to buy the absolute cheapest of everything, you are already saving money!
My mother carried something like this: https://www.amazon.com/Clover-Thread-Cutter-Pendant-Antique/dp/B000YQH0K8/ref=asc_df_B000YQH0K8/?tag=hyprod-20&linkCode=df0&hvadid=167125073482&hvpos=&hvnetw=g&hvrand=1055306287733809185&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9026502&hvtargid=pla-359972483647&psc=1
I don't know if it would cut yarn, but there's a pendant thread cutter (?) That a lot of cross stitchers use for travel.
Here's a JoAnns link, but I think Amazon/Michaels carries it too: https://joann.app.link/KLLNvKBnWob
Actually, here's an Amazon link too (I just grabbed one, feel free to search on your own): https://www.amazon.com/dp/B000YQH0K8/ref=cm_sw_r_apan_i_EWNGGHDFKGK7AGEZBDHM