My mother purchasing a home and needs a cosign if I cosign for her would that prevent me from getting accepted for FHA in the near future for myself?
Assuming you have a 'normal' DTI and aren't the CEO of a Fortune 500: She will need to demonstrate that she alone, without your help, has been making the payments for 12 months, before you can realistically hope to get a mortgage.
Assuming pre-covid mortgage guidelines. I cannot predict how that will shake things up, but it may be even more conservative than that in a week or a month.