What is her normal wake up time? Is 8am her regular time or does she usually wake earlier than that?
Can you also post today's EASY if it was different from the other day?
How do you decide when to put her down for a nap? Are you following sleepy cues or going by A times or both?
I wouldn't do WTS personally, but I know others have used it with success, but I think that's been after at least a week of doing that. To me, in a week anything can happen so it's hard to say if it's just a baby changing or if it's actually WTS.
In regards to shh/pat-no I wouldn't do it right to sleep. If you currently are, trying doing it less and less each time over the next few weeks. You want her to become an independent sleeper and you need to wean yourself out of that process slowly. Having said that, she is still young, so you have to be patient.
And at 18 weeks she may need more than one feed at night-just keep that in mind. What time is she currently eating during the night?
In regards to the 45 min nap, 1st of all its really common and normal at this stage, but you can always leave her for a few minutes each time to see if she will go back to sleep. Some babies kinda do a mantra cry for a bit and then go back to sleep. This is different from a full out hard cry-so you need to be attentive, but also not rush into her everytime.